How To Clean & Dry Your Toothbrush — And When To Just Replace It

While you might think that a quick rinse of the toothbrush under the tap is enough to keep it clean, oral hygiene experts say otherwise.

"The mouth contains many types of bacteria. While in the mouth they interact, and usually the 'good' bacteria hold the 'bad' bacteria in check," explains Mark B. Desrosiers, DMD, a member of the American Association of Endodontists and assistant professor at Boston University School of Dental Medicine. "A toothbrush is a different environment and can encourage the growth of the 'bad' bacteria if not cared for properly."

"Your toothbrush can harbor bacteria from your mouth, which will multiply if not disinfected," echoes Steve Dumas over at Philips Sonicare. "The best way to clean your mouth is with a brush you keep clean by sanitizing regularly."

No matter what kind of toothbrush you have, Grove Guides at natural cleaning marketplace Grove Collaborative Angela Bell and Georgia Dixon say to do your cleaning from the base up.

First, they recommend removing any toothpaste buildup from the handle with a solution of dish soap and warm water.

From there, remove the bristle head if it's detachable (no big deal if not; just stick the whole brush in) and submerge it in a glass of household hydrogen peroxide for at least 15 minutes. "This will help remove any toothpaste residue, as well as work away at bacteria on the bristles," they tell mbg. Desrosiers adds that if you don't have hydrogen peroxide on hand, antibacterial mouthwash would work here too.

"After soaking the toothbrush head, run under warm water and use your thumb to gently rub the bristles to remove any remaining toothpaste particles and the peroxide," the Grove Guides say. This step is important because although the household hydrogen peroxide found in most stores is only a 3% dilution, it's still not safe to ingest1.

Once your brush is squeaky clean, be sure to keep giving it a rinse with water after every use. Then, store it upright in an open container so it can air-dry.

Research shows that warm, moist conditions2 can cause the microorganisms on brushes to grow and flourish, so you'll want to keep yours in a spot that's as cool and dry as possible. While brush covers are good for traveling, this means they may not be best for everyday home use.

Even the most diligent of toothbrush cleaners and driers should replace their brush head every three months or whenever its bristles start to splay, Desrosiers says.