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The most common effect of too much fluoride is white spots on the front teeth. This picture is of a very mild case, which
is the most common (seems like about a fourth of parents have these).
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![pnfdecidu.jpg](https://raygrogan-ivil.tripod.com/sitebuildercontent/sitebuilderpictures/caries.jpg)
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The most common effect of too little fluoride is cavities. This is a pretty bad case so that the decay is visible. (You and
I can't even see most cavities before they are caught and fixed.) Many modern children still get at least a few cavities.
As early as age 5 years about half already have their first.
Growth
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