Which food, supplement or herb would be the best for gums and teeth health????

Which would be the best supplements, herbs and food to improve the health of gums and teeth?????. I am trying eating the pulp of a lemon on a daily basis just now. lemons are freshy and tasty but some doctors say that the acid of the lemons will atack the enamel of the teeth. Could it be true?????. I do not feel any pain when chewing the lemon pulp.

Claudio Acuña