Fluoride is an element, which has been shown to be beneficial to teeth. However, too little or too much fluoride can be detrimental to the teeth. If you are unsure if your drinking water has fluoride, please see your dentist today.
Fluoride
http://www.mouthhealthy.org/en/az-topics/f/fluoride
Fluoride: A naturally occurring mineral that has been shown to help prevent cavities in children and adults by making teeth more resistant to the acids from bacteria that cause cavities. It is found in water, toothpastes, and mouth rinses. It can be administered from a dental professional as a varnish, foam, or supplement.
Fluoridation Facts is the ADA’s premier resource on community water fluoridation. This 71-page booklet is a comprehensive encyclopedia of fluoridation facts taken from over 350 scientific references. Fluoridation Facts includes information from scientific research in an easy to use question and answer format on the topics of effectiveness, safety, practice and cost-effectiveness of fluoridation.