Short answer
No study shows that a sauna improves your teeth or gums. It does not replace brushing, flossing or dental check-ups, and it will not heal a dental infection. With a toothache, swollen gums or a fever, see a dentist and skip the sauna. Sweating a lot can dry out your mouth, so drink water before and after.
Some older articles claim that dry heat fights plaque, works like mouthwash or helps your gums heal. We could not find research that supports those claims, so this guide sticks to what is known and what you can actually do. It is general information, not medical or dental advice.
Can a sauna improve oral health?
Not directly. Regular sauna bathing is popular for relaxation, and you can read about the general benefits of sauna use elsewhere on SaunaHelper. But no study we found shows that it reduces plaque, tartar, gum disease or tooth decay.
Plaque is a film of bacteria that builds up on your teeth and contributes to gum disease and tooth decay. The NHS advice on keeping teeth clean is to brush with fluoride toothpaste twice a day for about two minutes and to clean between your teeth with floss or interdental brushes. A sauna cannot do that job.
Can a sauna be bad for your mouth?
The main thing to watch is a dry mouth. The NHS page on dry mouth lists dehydration, for example from sweating a lot, as one of the main causes, and notes that a dry mouth makes tooth decay more likely. That is a good reason to drink plain water before and after a session rather than sugary drinks.
If you feel sick in the heat, leave the sauna and cool down. Our sauna tips cover how to keep sessions comfortable.
Sauna with a toothache, abscess or gum problems?
Heat will not fix a dental problem. The NHS says a dental abscess needs urgent treatment by a dentist and will not go away on its own. Symptoms can include intense toothache, a swollen face or jaw and a high temperature. In that situation, skip the sauna and contact a dentist.
Bleeding, swollen or sore gums can be signs of gum disease, which the NHS advises having checked by a dentist. After an extraction or other dental treatment, ask your dentist when it is fine to use a sauna again.
Braces, aligners and dental work
If you wear braces or clear aligners, heat matters for the appliance more than for your teeth. Our guide on wearing Invisalign or metal braces in the sauna explains what to do with them.
Does the type of sauna matter?
No type of sauna has been shown to help oral health. The same simple rules apply to a traditional sauna, an infrared sauna and a steam room: drink water, keep sessions comfortable and stay out of the heat when you have a dental infection or a fever. For the differences between them, see our infrared vs traditional sauna comparison.
FAQ
Is sauna good for your teeth?
There is no direct evidence that a sauna is good for your teeth or gums. Brushing twice a day with fluoride toothpaste, cleaning between your teeth and regular dental check-ups are what protect them.
Can a sauna cause dry mouth?
It can. The NHS lists dehydration, for example from sweating a lot, as one of the main causes of a dry mouth. Drink water before and after your session.
Can I use a sauna with a tooth infection?
See a dentist first. A dental abscess needs urgent treatment and will not go away on its own. Skip the sauna while you have pain, swelling or a fever.
Does a sauna kill bacteria in your mouth?
We found no evidence for that. Plaque is a film of bacteria on your teeth, and it is removed by brushing and cleaning between your teeth, not by heat.
Sources
- NHS, How to keep your teeth clean, accessed 14.10.2026
- NHS, Dry mouth, accessed 14.10.2026
- NHS, Dental abscess, accessed 14.10.2026
- NHS, Gum disease, accessed 14.10.2026
Editorial note: This page summarises public health sources. It is not a clinical test and not dental advice.