The American Dental Association says that using fluoridated water in infant formula (powdered or liquid concentrate) means that your infant (ess than 1 year old)could be getting too much fluoride. This might lead to fluorosis, which can be seen as faint mottling on your child's teeth. However, fluorosis cannot occur once the teeth break through the gums. The ADA stresses that although too much fluoride might cause fluorosis, this does not always happen.
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American Dental Association answered
Water fluoridation has been proven to be safe and effective for all ages, including babies. Parents and caregivers should discuss with their dentist or physician about their children’s fluoride intake. Babies who are fed powered or liquid concentrate infant formula mixed with optimally fluoridated water might develop enamel fluorosis, which for the most part is a cosmetic condition. Fluorosis happens when a child takes in too much fluoride while his teeth are developing under the gums.
Water fluoridation helps prevent cavities because it helps the body make strong enamel. A baby who is exclusively formula fed may be at risk for mild fluorosis if fluoridated water is used to mix the formula. In mild fluorosis the teeth may develop small white specs, often only recognized by trained dental professionals. Mild fluorosis does not make the teeth weak; in fact, the teeth tend to be very strong. Moderate to severe fluorosis is often seen in places where there is an high level of fluoride in the drinking water.
Parents who are concerned about the possibility of fluorosis can use bottled water without fluoride for a least some of the bottle feedings.