Eat more fruits and veggies.

Choose whole grains. Try brown rice instead of white. Switch to whole wheat pasta.

Choose lean proteins like poultry, fish, beans, and legumes.

Cut down on processed foods, sugar, salt, and saturated fat. 

Avoid aerated drinks like coke, try fruit juices instead(fresh ones even more better)

Brush twice daily and floss once

Visit a dentist Bianually

For a healthy teeth and general good health follow the above tips