Can saliva affect the rate of tooth decay?

is it true that different people with different saliva, (in term of acidic and stuff) affect the speed or likelihood of tooth decaying??





i have a friend who do not brush teeth before sleeping, but he doesn't have any decaying sign in his teeth.





However i brush everyday, yet i see some black color stains in the teeth...=(

Can saliva affect the rate of tooth decay?
Yes, the pH of your saliva can affect tooth decay. It could also be the amount of saliva produced, since in general it prevents decay. People who have dry mouth tend to get decay more easily as well as people who breathe out of their mouth when they sleep. Drinking more water and staying hydrated helps. It may also be genetics. Your friend may have a thick enamel layer (which is the part that is eaten away when you get a cavity).
Reply:It's actually true but usually people with more acidic saliva eats away enamel. The black color stains may be from smoking, coffee, teas, and other various drinks. You may want to review over what your constant drinking or eating habits are and find out what may be causing them or up the ante and brush 2 times a day and use mouthwash and of course, the dentist is your friend be sure to visit often.
Reply:My dentist tells me this is true. I have maintained my teeth in a mediocre manner all my life, and every time I go to the dentist, he asks me why I'm there. My teeth seem to resist decay and tartar. He says it's my saliva.
Reply:suprisingly saliva actually protects the teeth by coting it with a thin layer. the stains could be caused by smoking, chewing tobacco, excessive amounts of tea or soda not saliva.