that is a tough problem. plantar warts and the treatment for them is pretty painful. you have to consider the fact that your daughter could spread these to others as much as preventing her from getting them again. plantar's warts are a strain of the HPV virus. it is not terribly contagious, but if one often goes barefoot in a public place and has abrasions on their feet from dancing, then the virus can get in. your daughter will quit getting them when her immune system begins to recognise this strain of hpv and keeps it at bay. I understand that modern dance is all about bare feet. however, can that be modified to allow for some kind of foot covering in practice? nylon footies or something? if not, then consider having everyone who has plantar's warts wear a bandaid (or more practically) coband wrap over the warts to cut down on spread. washing after practice is a great idea, but there probably is no fool proof way to prevent contraction of the hpv other than keeping the feet covered. It is possible depending on the strain of plantar wart that the gardisil hpv vaccine however, this really is a long shot and unlikely to cover the same strains as the gardisil targets the strains that cause cervical cancer specifically.