Years ago, it was believed that the fluoride incorporated in the teeth at the time they formed was the most important in terms of future resistant to cavities. The theory was that if fluoride was an integral part of the tooth structure, the tooth would be less susceptible to decay for a lifetime.

Now we've revised our thinking about that.

Recent research has shown that the major action of fluoride takes place not inside the tooth, but at its surface, when the fluoride comes in contact with saliva and plaque. Fluoride from all sources is stored in the mouth and on the teeth, in the plaque, in saliva and the soft tissues, ready for action. THIS is your fluoride reservoir.

Normally, there is an on going exchange of minerals between the enamel and the saliva. But when you eat, decay-causing bacteria in your mouth begin to feed, producing acid as a byproduct. That acid can upset the balance of mineral exchange, causing the tooth enamel to lose more mineral than it takes up. This results in a net loss of mineral for the tooth or "demineralization," and is the start of a cavity. BUT, if the fluoride reservoir is full, then this is a different story. The same acid that leads to demineralization triggers off a release of fluoride, which then becomes available "when" and "where" it is needed. This fluoride not only inhibits demineralization, but also promotes remineralization, rebuilding and reinforcing the tooth enamel, so that it is stronger. In effect, the fluoride "heals" the cavities in the early stages of development.

Many parents are often surprised that the pediatric dentist may recommend a topical fluoride application to remineralize an initial cavity. Only if that approach doesn't work, then the dentist will recommend filling the cavity.

There are two basic ways to get fluoride:

• Swallow it- as with supplements, or fluoridated water (Systemic fluoride)
• And Topical application - as with daily fluoride toothpaste, mouth-rinses, or gel treatments at the dentist's office.