If you have well water or regularly drink bottled water that is not fluoridated, your doctor may recommend supplemental fluoride. However, in 1999 and 2001 the CDC conceded that the predominant benefit of fluoride in reducing tooth decay is topical and not systemic. In other words, fluoride works best when it is applied to the outside of teeth. By ingesting too much fluoride, you can cause permanent white staining on teeth. Therefore, we recommend the regular use of fluoridated toothpaste and fluoride treatments instead of drinking fluoridated water.