Fluoride is an important mineral for dental health. It helps to harden the enamel on teeth, so bacteria has to work extra hard to get inside. Since 1945, many communities have added fluoride to their water supplies and have seen dramatic decreases in the occurrence of cavities. If you don’t live in an area that provides fluoridated water, there are a number of products available, from toothpastes and mouthwashes to fluoride drops or tablets.