Professional dental cleanings are now considered a standard recommendation - it is often suggested that they should be carried out every 6 months or even every 3 months. Those who can afford it (or have good supplementary dental insurance) are often praised. But how useful is it really? The answer, as so often, is: it depends.
Why clean teeth at all?
The professional Tooth cleaning (PZR) shall:
- Remove tartar and hard plaque
- Smooth the tooth surface
- Reduce bacteria
- Preventing periodontal disease
That sounds sensible - and in some cases it is. For example, people who have a lot of interdental spaces, develop very dense tartar or have inflamed gums can benefit from targeted cleaning. But what hardly anyone asks is: why do some people develop so much plaque in the first place - and others hardly any?
Tartar is not a fate - but a sign
Heavy tartar is often a signal from the body, not just a cosmetic problem. Causes can be:
- Too little saliva or altered saliva composition
- Excessive sugar or acid consumption
- Chronic mineral deficiency (especially magnesium, calcium, silicon)
- drink too little water
- Unbalanced oral flora (e.g. due to fluoride, mouthwashes, antibiotics)
So if you are constantly developing new coverings, you should not just rely on the PZR, but ask yourself: What could be going wrong in my system?
How often should I have my teeth cleaned?
Markus Schall's personal assessment:
"If you clean your teeth thoroughly every day, brush without fluoride and make sure you eat well, you only need professional teeth cleaning every 2 to 3 years at most - if at all."
This view is increasingly shared by naturopathic dentists. Regular, excessive dental cleaning can even be harmful - and this is rarely said openly.
Risks due to too frequent tooth cleaning
If you have an intensive PZR performed every 3 to 6 months, you should be aware of the possible side effects:
- Microcracks in the enamel
- Polishing machines or rotating brushes cause tiny surface injuries - entry points for bacteria.
- Loss of tooth structure
- Especially with sensitive teeth or thin enamel, frequent "polishing" can do more harm than good.
- Disruption of the natural oral flora
An over-cleaned surface loses its natural protective layer - germs colonize more quickly, which can paradoxically cause new problems.
The underestimated risks of frequent dental cleanings
1. release of heavy metals
Many people still have old amalgam fillings in their mouths - an alloy consisting of up to 50 % of elemental mercury. The following can occur during professional dental cleanings, especially with high-gloss polishing or ultrasonic devices:
- Vibrations and heat lead to the release of mercury vapor
- This vapor is absorbed through the mucous membrane or directly into the central nervous system when inhaled
- Particularly dangerous during unprotected cleanings (without rubber dam, suction, activated charcoal, etc.)
The problemMercury is a neurotoxic heavy metal that prefers to be deposited in the brain - where it can act silently. The consequences often only become apparent decades later in the form of:
- cognitive deficits
- Concentration disorders
- Depression
- States of anxiety
- and finally: dementia or Alzheimer's-like symptoms
Studies show that chronic, low-dose exposure to mercury may be one of the most likely environmental causes of Alzheimer's disease.
2. micro-damage to tooth enamel - entry point for germs
Many dentists use so-called polishing pastes with abrasive substances or rotating polishing heads during the PZR. These produce a smooth surface in the short term - but often at the expense of the enamel structure:
- Microcracks in the enamel
- Exposure of dentinal tubules
- Hypersensitivity to hot, cold or sweet foods
- Increased risk of tooth decay and internal inflammation
What many do not knowBacteria can penetrate directly into the tooth interior or the bloodstream via these microdamages - especially if the gums are bleeding or the periodontium is already damaged.
3. disruption of the nervous system by fluorides
In many dental practices, fluoride-containing polishing paste or varnish is used during the PZR - sometimes without any information. However, fluoride is not a harmless nutrient, but a potent neurotoxin that has a toxic effect on cells in high doses. In the long term, systemic fluoride exposure can lead to demineralization of other tissues, thyroid disorders and neurological abnormalities. There is a current systematic review + meta-analysis (2025) of Taylor, Eftim et al., the 74 studies (cohort and cross-sectional studies) from several countries. Significant inverse correlations were found between fluoride exposure and children's IQ.
Particularly dangerousCombination of fluoride and aluminum (e.g. from deodorants, baking powder or environmental pollution). This compound can penetrate the blood-brain barrier - a possible mechanism in Alzheimer's disease
4. the false belief in hygiene instead of immune balance
Regular dental cleaning is often equated with "health" - but the human body needs natural stimuli to keep its immune system active. An over-cleaned oral cavity:
- disrupts the oral microbiota (oral flora)
- Makes you more susceptible to pathogenic germs
- and can lead to oral dysbiosis - a condition that favors chronic inflammation
These processes take place silently, but over the long term - and are closely linked to:
- Rheumatism
- chronic fatigue
- Neurodegeneration
- and also cardiovascular diseases
5. connection with Parkinson's and mitochondrial stress
Numerous reports (e.g. from environmental dentistry) describe a striking correlation between:
- Excessive contact with the dentist
- high heavy metal load
- mitochondrial collapse (energy loss at cell level)
- and Parkinson's diseases in later life
A possible triggerRegular dental cleanings, during which small amounts of metallic or toxic particles enter the tissue each time, can disturb the neuronal balance in the long term - especially if there is a simultaneous deficiency of lithium, magnesium and selenium.
Fluoride - protection or harm? An honest view
Fluoride has been standard in almost all dental care products for decades. Hardly any advertising can do without the promise "Protects against tooth decay - thanks to fluoride". But as always, it is worth taking a second look. Because what is sold as prevention has side effects that are rarely talked about - especially if fluoride is used on a daily and long-term basis.
What is fluoride - and how does it work?
Fluoride (F-) is a highly reactive ion that is usually added to toothpastes in the form of sodium fluoride, amine fluoride or stannous fluoride. It is said to:
- Harden the enamel
- reduce the acid solubility of the surface
- inhibit the growth of caries-causing bacteria
Sounds good - but the truth, as so often, lies in the details.
Too hard enamel - a problem?
Yes, if the tooth structure is hardened unnaturally:
- Fluoride is deposited in the uppermost layer of the tooth - not deeply, but purely superficially.
- This layer becomes harder than natural dentine, but also more brittle.
- Similar to glass: hard, but not elastic. And therefore more susceptible to breakage.
In concrete terms, this means that teeth with regular fluoride application can chip more quickly, especially in the case of minor trauma - e.g. when chewing on a hard grain or grinding your teeth (CMD!).
Fluoride and tartar formation - is there a connection?
This is not a myth either, but a real suspicion shared by many naturopathic dentists. The following is discussed: Fluoride slightly changes the composition of saliva - especially the pH value and calcium binding are affected. Microcrystalline deposits are formed, which can accelerate the build-up of tartar, especially in combination with magnesium or calcium ions from saliva and water.
In addition, fluoride only smoothes the surface, which can even make it easier for plaque to adhere to rough areas (e.g. exposed dentine). Some studies suggest that fluoridated toothpaste even promotes the formation of tartar if the saliva composition is right - a contradiction to the original advertising promise.
Neurological risks with fluoride - only in case of overdose?
The official bodies (WHO, BZgA, dental associations) always emphasize that fluoride is only harmful "if the dose is too high". But what does this mean in everyday life? With daily use of fluoridated toothpaste, fluoride varnish at the dentist, fluoridated salt and possibly even fluoridated drinking water, the limit for chronic overuse can be quickly exceeded.
- Cumulative effectFluoride is not completely excreted, but is deposited in the body - in the bones, kidneys and brain, for example.
- Particularly criticalChildren, people with renal insufficiency or detoxification disorders (e.g. MTHFR mutation)
Studies indicate a connection with:
- Hypothyroidism
- Brain disorders (especially in children)
- Impairment of the energy metabolism
- and even early dementia
The combination of fluoride + aluminum is of particular concern, as it crosses the blood-brain barrier - a possible mechanism for neurodegenerative diseases. People with hypersensitivity or MCS (Multiple Chemical Sensitivity) should also be careful with the daily use of fluoride.
CMD, sensitive teeth and individual strategies
In the case of special dental issues such as CMD (craniomandibular dysfunction) or hypersensitive tooth necks, it is particularly important not to take a blanket approach. Too much cleaning can do more harm than good. Gentle care, selective support and patience are often the better approach.
In my book "TMD - The forgotten problem of modern medicine" I describe how much functional disorders in the jaw area are underestimated - both by patients and doctors. The new article on teeth cleaning and its potential risks adds an often neglected perspective to this topic: how interventions on the teeth - even supposedly harmless ones such as professional teeth cleaning - can have an impact on the entire body system.
Particularly in CMD patients, whose tooth structures are often damaged by clenching, grinding or previous incorrect loading, aggressive polishing procedures or fluoride-rich cleaning agents can cause additional irritation - and thus exacerbate existing complaints. Anyone suffering from CMD should therefore not only observe their masticatory muscles, but also consciously scrutinize the procedures in the dental practice. This connection between microtrauma, silent inflammation and neurovegetative disorders is rarely addressed in conventional dentistry - but is part of any holistic treatment approach for CMD.
The safe alternative: hydroxyapatite instead of fluoride
Hydroxyapatite is a bioidentical tooth enamel substitute that is used in toothpastes such as Bioniq Repair or Dr. Wolff Biorepair. Advantages:
supports real remineralization.
- non-toxic
- Hardens the tooth in a natural way
- promotes healthy oral flora
- Gently protects sensitive tooth necks - without side effects
Markus Schall: "Since I've been using Bioniq Repair (with hydroxyapatite), I've never chipped a tooth again. Before, with daily use of fluoride toothpaste, this happened regularly."
When professional teeth cleaning really makes sense
As justified as the criticism of excessively frequent dental cleanings is, there are certainly situations in which a well-performed professional dental cleaning (PZR) is very useful, even necessary.
If the dental apparatus is already damaged
People with exposed tooth necks, periodontitis, deep pockets or increased tartar build-up often benefit considerably from targeted cleaning - not for "cosmetic" purposes, but to prevent inflammation. Bacterial plaque in gum pockets cannot be removed with a toothbrush.
Deep tartar can only be removed professionally
If you have poor oral hygiene due to illness, medication or physical limitations, a dental cleaning can significantly reduce the risk of tooth loss. A well-performed PZR can:
- Reduce inflammation of the gums
- Stop bleeding
- Slow down or prevent pocket formation
- and curb the progression of periodontitis
For senior citizens or people with limited motor skills
Many older people - or those with neurological diseases such as Parkinson's or MS - are limited in their daily dental care. Their fine motor skills are often no longer sufficient to clean their teeth adequately. In such cases, dental hygiene can be an important tool to ensure tooth preservation. Regular gentle cleanings can help to keep the situation stable, even if everything no longer works perfectly at home.
For severe bad breath or chronic mucosal irritation
Halitosis (bad breath) is also often caused by plaque, tongue coating or bacterial colonies in gum pockets. Professional cleaning, combined with tongue cleaning and possibly microbiological diagnostics, can bring real improvements here - not only in terms of well-being, but also in everyday social life.
After intensive dental treatment
After root canal treatment, implants or major filling work, a targeted dental cleaning can help to stabilize the newly treated area, reduce inflammatory processes and promote long-term healing. However, it is important not to do this too early - and not too aggressively.
Dental health doesn't need routine - it needs responsibility
Daily dental care is not a marginal issue, but a reflection of our attitude to our own bodies. And while we are often led to believe that only regular visits to the dentist, expensive products and the most aggressive cleaning methods possible really "protect" us, in practice the picture is often different: dental health is not a matter of luck - it is a question of habit, mindfulness and information.
What really counts: Daily care, not blind trust
Many people have their teeth professionally cleaned every three or six months - without knowing what is actually done there:
- What substances are used? Are fluoride-containing substances used?
- Are polishing machines used even though the enamel is already damaged?
- How are old fillings dealt with - e.g. amalgam?
Questions like these are often not asked - or not answered. And this is precisely where the risk lies. It is not the cleaning itself that is the problem - but the routine idea that has turned a medical procedure into a subscription model.
My personal experience: less is more - if you do it right
"I brush my teeth daily with a high-quality electric toothbrush (IQ series from Braun) and a fluoride-free toothpaste with hydroxyapatite (e.g. Bioniq Repair). I watch what I eat, drink lots of water - and I have my tartar carefully removed by the dentist maybe once every eighteen months. No more. At the second appointment, my dentist sometimes says: 'We could do a dental cleaning now. And then I ask beforehand exactly what will be done - and ask for the gentlest, fluoride-free cleaning possible, without a polishing machine, unless it's really necessary."
This approach has worked for me for years - no new cavities, no excess tartar, no more chipped teeth. Before, in the years with fluoride and standard toothpastes, it was different: chipped areas were the order of the day. This is not proof, but it is a clear sign.
Conclusion: the risks are real - but avoidable
Professional teeth cleaning is not the devil's work. But if you routinely have it done every three months without informing yourself about materials, methods and protective measures, you are taking long-term health risks that could be avoided. Questions you should ask yourself:
- Do I still have old fillings in my mouth?
- Will I be informed about the substances used before the PZR?
- Is there a sensible alternative to high-gloss polishing?
- Why do I get so many plaque deposits?
- And: What can I do to strengthen my oral health on my own responsibility - instead of leaving it to the dentist?
An appeal to common sense
Of course, there are also borderline cases. People with severely damaged teeth, chronic inflammation, poor diet, alcohol abuse, medication or genetic weaknesses - regular teeth cleaning may be medically advisable for them. But even then, the following should apply:
Not everything that sounds "prophylactic" is healthy.
Not everything that shines protects.
And not every white coat deserves blind trust.
Frequently asked questions about professional teeth cleaning
- What exactly is professional teeth cleaning?
Professional teeth cleaning (PZR) is a dental service for the thorough removal of plaque, tartar and discoloration. Special equipment is used to remove plaque above and - in some cases - below the gum line, which cannot be reached with normal tooth brushing. The teeth are then polished and often treated with fluoride. It is considered a supplement to daily oral hygiene. - How often should I have my teeth professionally cleaned?
The recommendation varies: Many dentists recommend 1-2 dental cleanings per year. Shorter intervals may also be advisable if there is an increased risk of periodontitis, tooth decay or certain pre-existing conditions (e.g. diabetes). However, critics note that too frequent dental cleanings can put a strain on the gums or the tooth structure - a point that patients should discuss individually with their dentist. - Is a PZR harmless to health?
This depends on the condition of the gums and teeth, the frequency of use and the technique used. As a rule, PZR is harmless, but can lead to problems if used excessively or improperly - such as gum recession, microcracks or sensitivity. It is important that it is carried out professionally by trained specialists. - Can bacteria get into the blood or brain through PZR?
Yes, this is theoretically possible. Especially with inflamed gums or open micro wounds, bacteria can enter the bloodstream during cleaning - a so-called bacteremia. In individual cases (especially in immunocompromised people or people with heart valve replacements), this can have serious consequences. A sterile working method and a healthy general condition minimize this risk. - Does a PZR remove tooth enamel?
Normally no - as long as the PZR is carried out properly. However, excessive use or improper technique (e.g. excessive polishing or aggressive brushing) can damage the enamel. Therefore, the frequency and method should be adjusted individually. - How much does professional teeth cleaning cost?
The costs vary depending on the dental practice and the extent of the treatment, but are usually between 70 and 140 euros. Statutory health insurance companies do not usually cover the costs in full, but some do pay a subsidy. Privately insured people are often reimbursed for the PZR - depending on their tariff. - Is professional tooth cleaning necessary if I brush well?
Not necessarily. Those who consistently practise good oral hygiene (e.g. with an electric toothbrush, interdental brushes, tongue cleaner, etc.) and have no pre-existing conditions often benefit significantly less from regular PZR. However, dentists see it as an additional preventive measure - especially in hard-to-reach areas. What is important here is an honest assessment by the dentist, not an automatism. - Can a PZR cause pain?
For healthy teeth and gums, the PZR is usually painless. However, people with exposed tooth necks or inflamed gums often find the treatment unpleasant or even painful. The final polishing or fluoridation can also be sensitive. Patients who are sensitive to pain should discuss this beforehand. - What happens if you permanently forgo the PZR?
Most people can manage without regular dental cleaning - provided they practise consistent oral hygiene. However, those who are prone to plaque, tartar or gingivitis can benefit from a dental cleaning. However, there is no evidence-based obligation to have a dental cleaning - it is an individual decision, not a must. - Can fluorides used in teeth cleaning be harmful?
In normal doses, fluorides are considered safe - they harden the tooth enamel and prevent tooth decay. However, there are discussions about the possible long-term consequences of high fluoride intake, e.g. through drinking water, toothpaste and also through dental cleaning. Some patients therefore prefer fluoride-free alternatives or explicitly ask for a dental cleaning without fluoridation. - Are there alternatives to professional teeth cleaning?
Yes, if you brush carefully every day, clean between your teeth and go to the dentist regularly, you can achieve many of the benefits of PZR without it. Special toothbrushes (e.g. sonic toothbrushes), toothpastes with hydroxyapatite, oil pulling or the use of interdental brushes are other useful components. Some also rely on natural products such as xylitol or alkaline mouthwashes. - Should I have a PZR during pregnancy?
Special care is required here. Although good oral hygiene is expressly recommended during pregnancy, aggressive cleaning can be problematic if the gums are inflamed. Pregnant women should clarify with their dentist in advance whether a gentle cleaning is advisable or whether it is better to wait. Fluoride can be avoided during pregnancy if necessary. - Can germs migrate to other organs through PZR?
Yes, in very rare cases. If germs enter organs via the bloodstream, they can lead to endocarditis, e.g. in the case of previously damaged heart valves. For this reason, antibiotic prophylaxis is sometimes recommended before the PZR in the case of certain pre-existing conditions (e.g. artificial heart valves, immunodeficiency). This should be discussed individually with your family doctor or dentist. - Are there any studies on the effectiveness of PZR?
Yes - but the data is not conclusive. Some studies show a reduction in plaque and gingivitis through PZR. Others point out that the benefit is rather small compared to good dental care at home. There are hardly any long-term studies with hard endpoints (e.g. tooth loss), which is why many critics question the actual additional benefit of PCR. - Why is PZR not fully covered by statutory health insurance?
Because it is not classified as medically necessary. The statutory health insurance funds only pay for "sufficient, appropriate and economical" services. The PZR is considered an individual health service (IGeL). Part of the costs may be covered by bonus programs, supplementary dental insurance or prevention programs. - How do I find a good practice for professional teeth cleaning?
It is important to have trained staff, transparent information and an individual assessment - not just sales rhetoric. Good practices take the time to answer questions, explain exactly what is being done and offer alternatives (e.g. teeth cleaning without fluoride, gentler procedures). Reviews on the internet, recommendations from friends and acquaintances or a personal consultation can help you make the right choice.