Guide · Teeth & gums
Oral probiotics: what they can and can't do for your gums
Probiotic lozenges and chewables for the mouth are getting popular. Some research is promising, but it is early. Here's how to think about them, and what matters more.
What oral probiotics are
They are "good" bacteria, usually Lactobacillus or Bifidobacterium strains, in a lozenge, chewable or gum that dissolves in the mouth. The idea is to support a healthier balance of bacteria around teeth and gums.
What the studies show
Most trials are small and short. A 2020 review of ten placebo-controlled trials in gingivitis found the overall evidence weak. For L. reuteri, one of the most studied strains, the pooled results for gum and plaque scores were not statistically significant. Some studies in people already treated for periodontitis are more positive, but researchers agree that better trials are needed.
The habits that matter more than any supplement
- Brush twice a day with fluoride toothpaste.
- Clean between your teeth every day (floss, interdental brushes or a water flosser).
- See your dentist regularly. Gum disease is often painless until it is advanced.
- Limit sugary snacks and drinks between meals.
- Don't smoke. Smoking is one of the biggest risk factors for gum disease.
- Ask about dry mouth if you take several medications. Saliva protects your teeth.
See a dentist if you notice
Bleeding when you brush, receding or swollen gums, loose teeth, or bad breath that doesn't go away.
If you want to try an oral probiotic
- Look for named strains (for example L. reuteri) rather than a vague "blend".
- Keep brushing with fluoride toothpaste; ignore ads that call toothpaste "toxic".
- Give it a fair trial (a few weeks) and judge it by what your dentist sees at your next visit.
Compare products at iHerb (oral probiotic search), or read our ProDentim review.