Hydrogel butt injections are less aggressive forms of butt augmentation. The solution delivered through the injection is composed of water and polyacrylamide. Upon administration, this solution works as a filler to round out the bottom and provide patients with a curvier figure. The effects of hydrogel injections last for give or take a year and a half. The United States government has yet to legalize this buttocks enhancement procedure. Despite this, there are still clandestine markets that offer this type of butt injections.