Research
Research overview
Packs of toothpaste, mouthwash and whitening kits often say "clinically proven" or "recommended by dentists". On their own, these words say nothing about how reliable the evidence is. Here is a short guide to the types of studies and questions that will help you tell a tested claim from a marketing trick.
The wording on the box is marketing, not a study's conclusion. What deserves checking is not how loud the words are but what stands behind them.
Types of studies
| Type | What it shows | Limitations |
|---|---|---|
| Randomised controlled trial | Whether results differ between people randomly assigned to use the product and a comparison group | Can be small and short; conditions are often stricter than in everyday life |
| Cohort study | How oral health changes over time in people with different habits | Shows an association but not always a cause: the groups may differ in other ways too |
| Case-control study | How people with a disease differed in the past from those without it | Relies on participants' memory and is better suited to generating hypotheses |
| Systematic review | A summary of studies on one question, found and selected according to rules set in advance | Its conclusion cannot be more reliable than the original studies |
| Laboratory study | How a substance acts on enamel or bacteria in a test tube | The mouth has saliva, diet and habits, so the result cannot be transferred directly |
| Case reports and reviews | What happened to one or a few people | Cannot separate the product's effect from coincidence and expectations |
How to read "clinically proven" claims
Find out what exactly was proven
Check which effect is meant: less plaque, less sensitivity, a lighter shade. A general phrase with no specifics promises nothing.
Look for the study
Honest advertising usually says where the data were published or who produced them. If there is no reference, the claim cannot be checked.
Hypothetical example: a footnote in small print on the back of the pack, worth reading before you buy.
Find out what it was compared with
The word "better" only means something next to the answer to "better than what?". A comparison with not brushing at all and a comparison with ordinary fluoride toothpaste are very different things.
See who it was tested on
Testing on a handful of volunteers or only in a test tube is a weak basis for conclusions about your teeth.
Separate big words from substance
Impressive wording can hide a small real difference. If it does not say how many participants there were and how long they were followed, treat the promise with caution.
Hypothetical example: the phrase "many times more effective" with no explanation of more effective than what, or by what measure.
Discuss it with your dentist
Show your dentist the pack or link and ask whether the product suits your teeth and gums. Do not give up fluoride toothpaste and your usual routine for a new product without talking to your dentist.
Red flags in care-product advertising
- "Clinically proven" without naming the study or the organisation
- A promise to whiten teeth in one evening or forever
- A product that supposedly "replaces a visit to the dentist" or "cures decay at home"
- Only reviews and "before and after" photos instead of data
- References to "dentists" with no names or workplaces
- Pressure to buy urgently while the "secret formula" is available
- A promise to get rid of pain, bleeding or bad breath without finding the cause
Related sections
- Methods
The kinds of dental care, how to discuss a treatment plan and which promises not to trust.
- Ask your dentist
Questions worth asking your dentist at a check-up, before treatment and afterwards.
- Glossary
Words from the dental surgery and paperwork: enamel, pulp, plaque, filling, treatment plan.
Sources
- WHO — Global Oral Health Status Report (2022)
- FDI World Dental Federation — patient information
Information is current as of the date prepared. Oral-care recommendations, the scope of dental care covered by Russia's compulsory medical insurance (OMS) and the rules for medical paperwork may change. Check the current documents and ask your dental clinic or insurer for details; arrangements differ in other countries.