We have all read the back of toothpaste... Haven't we? The warning reads something like this: Keep out of reach of children under 6 years of age. (ok) If more than used for brushing is accidentally swallowed, get medical help or contact a Poison Control center right away. Well.... It is also put into our water supply. It is absorbed through drinking and though the skin. Here is a map of its use. File:Fluoridated-water-extent-world.svg - Wikipedia, the free encyclopedia So, this is what bothers me... Here is the MSDS (Material safety data sheet) for Sodium Fluoride. MSDS :: Sodium Fluoride Here are some highlights: May be fatal if inhaled, swallowed or absorbed thru the skin Avoid all contact. Use with adequate ventilation. Wash thoroughly after use. Keep container closed. FIRST AID: CALL A PHYSICIAN. SKIN: In case of contact, immediately flush skin with water for at least 15 minutes while removing contaminated clothing and shoes. Thoroughly clean clothing and shoes before reuse. EYES: Wash eyes with plenty of water for at least 15 minutes, lifting lids occasionally. Seek Medical Aid. INHALATION: Remove to fresh air. If not breathing, give artificial respiration. If breathing is difficult, give oxygen INGESTION: If swallowed, induce vomiting immediately after giving two glasses of water. Never give anything by mouth to an unconscious person. So, What do you think? Is this something we should be putting in our water supply? I understand that the concentration is maybe 10ppm, but Fluoride doesn't leave the body.. So it can have a accumulative effect.