Sick or brown spots
Having too much topical Fluoride
can make some throw up and that includes digesting fluoridated mouthwashes.
If you have water from a well that has high Fluoride levels and are taking Fluoride containing vitamins (infants) then you could be getting too much Fluoride and develope brown spots on your teeth. It is wise to try to have your water tested and watch the baby vitamins but necessary! earl.