Xylitol Toothpaste Benefits and Side Effects

Xylitol toothpaste is a type of toothpaste that contains xylitol, a sugar alcohol sourced from birch trees and other types of hardwood trees and plants. Xylitol is believed to improve dental health; it tastes sweet, but unlike sugar, it isn't converted in the mouth into acids that can promote tooth decay.

Said to slow the growth of Streptococcus mutans (the bacteria most closely associated with tooth decay), xylitol toothpaste is often touted as a natural approach to cavity prevention.

Xylitol is also used as an ingredient in dental care products like chewing gum, lozenges, tablets, and breath mints.

The Research on Xylitol Toothpaste: Does It Work?

Although research on xylitol toothpaste has yielded mixed results, there's some evidence that brushing with xylitol toothpaste may provide certain dental health benefits:

Benefits of Xylitol Toothpaste

In a 2015 report from the Cochrane Database of Systematic Reviews, for instance, scientists sized up 10 previously published studies (with a total of 5,903 participants) on the use of xylitol to prevent cavities. In their review, the report's authors found that over two-and-a-half to three years of use, a fluoride toothpaste containing 10% xylitol reduced cavities by 13% when compared to a fluoride-only toothpaste. The study authors noted, however, that the evidence was considered low quality and recommended large, well-designed clinical trials.

A 2014 study from the Journal of Dentistry for Children assessed the effectiveness of xylitol toothpaste in preventing early childhood cavities and reducing streptococci mutans. For the study, 196 four to five-year-old children brushed their teeth with either a fluoride toothpaste with 31% xylitol or standard fluoride toothpaste. After six months, the xylitol toothpaste wasn't found to be more effective than the standard fluoride toothpaste.

Other research hasn't found xylitol toothpaste to be effective at reducing the growth of oral bacteria. For instance, a laboratory study published in the European Archives of Paediatric Dentistry in 2015 compared the effects of different types of toothpaste on the growth of Streptococcus mutans and Lactobacillus acidophilus. The researchers found that xylitol toothpaste did not significantly inhibit the growth of Streptococcus mutans or Lactobacillus acidophilus.

Xylitol Toothpaste Side Effects

Xylitol has been approved for safety by the U.S. Food and Drug Administration as a non-nutritive sweetener.

Adverse effects that have been reported in studies include mouth sores, bloating, cramps, constipation, gas, loose stools, and diarrhea. Xylitol toothpaste shouldn't be ingested or left in the mouth without rinsing.

It's important to note that xylitol toothpaste shouldn't be used as a substitute for standard care in the treatment of a dental condition (such as periodontitis). If you are considering trying a xylitol toothpaste, it's a good idea to consult your dentist first.

Xylitol is extremely toxic to dogs. If your dog eats xylitol toothpaste, it is important to take the dog to a veterinarian immediately.

A Word From Verywell

Although it's too soon to tell whether xylitol toothpaste can significantly cut your risk of cavities, it's possible that xylitol products may be of some benefit when used in conjunction with standard measures to prevent cavities.

For optimal dental health, the National Institutes of Health suggest brushing your teeth every day with a fluoride toothpaste, cleaning between your teeth every day with dental floss or another type of between-the-teeth cleaner, limiting your consumption of sugary foods, avoiding tobacco use and smoking, and seeing your dentist or oral health professional on a regular basis.

There's also preliminary evidence that several foods may help protect against cavities. For instance, some research indicates that black tea and oolong tea can each help prevent tooth decay. And in a research review, scientists note that cranberry may help fight tooth decay by preventing bacteria from sticking to teeth.