What is the best way to prevent cavities?
The two major components involved in preventing cavities are home care and professional care. In particular, follow these simple steps:
1.Brush your teeth with a fluoride toothpaste twice a day.
2.Floss daily.
3.Eat nutritious and balanced meals and limit the amount of
  refined sugars you eat.
4.Brush immediately after eating sweets because the amount of
  time the teeth are exposed to sugar is a critical factor in the
  development of cavities.
5.Check with your dentist about the use of sealants on the
  chewing surfaces of the back teeth to protect them from decay.
6.Visit your dentist regularly for professional cleaning, fluoride
  treatment and oral examinations.