Daily brushings and flossing, a healthy diet, as well as regular visits with a dentist for cleanings and fluoride treatments can help prevent cavities. Brushing and flossing daily help keep the unhealthy plaque off teeth that weakens tooth enamel and invites decay in. A healthy diet, one that minimizes sugar intake, again helps keep teeth strong. Regular visits to a dentist can help with deeper cleanings, as well as find the onset of any decay and provide a plan to fix it.