I'm not sure what this is. You can get abnormal calcifications on the teeth
from too much fluoride. Most likely this is a problem with the enamel, but
it is not likely due to breastfeeding. Even if it were, these are baby
teeth, and will be replaced by adult teeth starting around 6 years. There
is no reason to believe that nursing would cause problems for the adult
teeth. (No matter what the dentist told this mother).
Jack Newman, MD, FRCPC