I did it 5 years ago at a famous lip filler house and it didn't melt. No matter how expensive and famous it was and the director took good care of it, it was done in a factory way to some extent. At the time, I didn't need a lip corner filler, but I put it in as I wanted. I just don't use fillers. I'm too afraid of the side effects. I haven't had any side effects, but I will never do it in the future.