Fluoride has been shown to dramatically decrease a person’s chances of getting cavities by making teeth stronger. Fluoride in the drinking water is the best and easiest way to get it. Most major cities have fluoride in the drinking water system. In communities where the water district does not fluoridate the water, fluoride supplements should be given to your child until their twelve year molars are fully erupted (approximately age 12 years). Your pediatric dentist or pediatrician can help determine if your child needs fluoride supplements or not.