Both chitin and chitosan can be used in toothpaste, mouthwashes and chewing gums, freshen breath and prevent plaque formation and tooth decay.

The chitosan salts added to the toothpaste mask the unpleasant taste of silicon oxide and bind powders, allowing them to retain their granular shape. Chitin can also be applied as a dental filling material. Both Chitin and Chitosan absorb candida a thicans, a fungus that adheres to teeth and makes them candidates for cleaning dentures.