Even though I had deep cheek removal surgery because the contouring injection was not effective, my double chin did not improve, so I received 3 cutting injections for the deep cheek area and double chin. (It is effective with just one shot, but it is said that it needs to be administered three times or more to be maintained.) I swelled like a squirrel on the same day, and the swelling went down quickly. I've used it 3 times and it's still going well, but I recommend 6 times if you want to see more results!