Candace was visited by the tooth fairy last night. So until Sarah becomes inspired to wiggle her tooth loose and pull it out (as Candace did), the gap-toothed one is Candace and the one with all of her teeth is Sarah.
About their shirts: Sarah Fikir's Ethiopian name means love in Amharic; and Candace Selam's means peace. Hence the heart and peace sign on their shirts. Yeah, I'm pretty clever like that.