There are good benefits to fruit juice, however just like soda they can still be harmful to your child teeth.  According to the head of a leading Dentistry University in Australia, juices, contain citric acid which can dissolve the hard structures of your teeth, especially the exposed roots and the enamel, which leaves the inner parts of teeth exposed. This, in turn, leads to tooth sensitivity.  The healthiest drink you can give your child is water but you do not have to stop all other drinks. Give limited amounts of fruit juice and soda and have your child drink out of a straw to limit contact on there teeth.