The discovery of fluoride and its ability to control tooth decay is one of the most important medical discoveries ever made. Fluoride helps prevent tooth decay by slowing the breakdown of enamel and strengthening weak spots on teeth and exposed roots. Many public water systems now add fluoride to your drinking water. If you don’t have public water, or if your teeth are resistant to fluoride, Dr. Petroff or your hygienist can apply a fluoride treatment for you or your children as needed. Of course, you can help by brushing regularly with a fluoridated toothpaste.