Evidence that eating chocolate does not cause acne comes from two studies: one of the Pennsylvania School of Medicine, the other by the U.S. Naval Academy. Their found that there was no difference in the skin condition between the study participants who did, or did not, eat chocolate. There is also no proof that chocolate is the cause of tooth decay. In fact, it is believed that the cocoa butter in chocolate forms a coating over teeth that may help to protect them. The sugar in the chocolate can cause cavities, but, no, more than sugar in any other food or drink.