Radiesse can last for up to a year and, sometimes, even longer. There is, perhaps unfortunately, no "reversal" agent for Radiesse the way there is for the HA products. Even in that case, though (ie, the HA products) there is no guarantee that an unfavorable result or complication can be reversed adequately. At least, though, there is a product that "dissolves" whatever portion of the filler material it comes in contact with. There is no comparable product for Radiesse and, as such, you have to wait for it to disappear on its own. That can take up to 18 months, or sometime even longer, but does not usually take that long in my experience.I hope that this helps and good luck,Dr. E