Dental cavities are NOT caused by a deficiency of fluoride! Dentists have known and acknowledged for over 50 years that the primary cause of cavities is consuming too much sugar.
Not only does reducing sugar consumption prevent cavities, but it also improves general health in many other ways.

Part 1:  How Sugar Keeps You Trapped in a Cycle of Addiction
Part 2:  What You Don't Know about Sugar Can Kill You
Part 3:  Incredible Things Happen When You Give up Sugar