how do i know if my child is getting enough fluoride   

Fluoride helps to maintain healthy teeth by combating tooth decay problems. The drinking water usually contains optimum amount of fluoride required by children and adults. In case if you are not sure, you can get your drinking water checked for the fluoride amount present in it by officials from public health department. You can then consult your child's dentist to make sure it is the right amount needed by children. If there is anything wrong, your child's dentist will recommend specific measures.