The study concluded that chitosan interferes with the process of demineralization of the tooth enamel, inhibiting the release of phosphorus. Demineralization is influenced by the concentration and exposure time of the biopolymer to the enamel. Microhardness measurements may be used as an indication of mineral loss from tooth enamel. Additionally, OCT images support the idea that chitosan may act as a barrier against acid penetration, contributing to its demineralization inhibition.
(Source: Journal of Dentistry, November 2010, Volume 38, Issue 11)