Once implanted, extracting all of the silicone is next to impossible. And because of liquid silicone's tendency to flow and move about, the original "heightened forehead" may turn into drooping eyebrows and eyelids. A "high" nose may become a "big" one, where an overly large bridge brings to mind the hooked witches 'noses found in comic books.
又由於液態矽會流動的特性，原本做「豐額」手術的，可能形成眉毛下垂、兩邊眼皮也會塌蓋下來；隆好的鼻子，慢慢鼻頭也會變大，甚至整個鼻樑大起來，而且往下勾垂，成了漫畫裡的「巫婆鷹鉤鼻」… …。