Maybe there can be too much of a good thing! Fluoride, which is added to toothpastes and city water supplies to reduce cavities and tooth decay, is now considered the culprit in a tooth-spotting epidemic that has hit pre-teens and teenagers. According to the Centers for Disease Control and Prevention, kids are suffering from fluorosis, a condition that is the result of over-fluoridated water, and the U.S. Department of Health and Human Services is now recommending that local municipalities reduce the amount of fluoride placed into their water supplies. We love seeing our lil ones' pearly whites. Take this quiz to see how much you know about tots and fluoride.