Neem bark extracts can reduce the ability of some streptococci to colonize tooth surfaces. Gingivitis has been prevented or even reversed with regular use of neem toothpaste with regular use of neem toothpaste and mouthwash. One person even reported a reversal of the loss of gum tissue by chewing fresh neem leaves.
Scientists believe that antibacterial compounds and neem's ability to improve the immune response in the gums and tissues of the mouth account for these results. Brushing with neem toothpaste after every meal and using a mouthwash with neem extract is recommended treatment for preventing and correcting gingivitis. For severe cases also drink neem tea daily for one week.