Brushing your teeth right after a meal or a drink may be doing more harm than good. Many foods and drinks contain a fair amount of acid – brushing while the acid is still in your mouth can cause increased damage to your teeth. Rinsing with water- a pH of 7.0 – helps to reduce the acidity of your mouth quickly.
The best thing to do is to rinse your mouth with water immediately following a meal or a drink, wait 30 minutes, then brush.
Chewing on certain foods and gums can also reduce the acidic environment in your mouth.