After getting regular botox on my forehead/crows feet for years, I'm familiar with it in those areas. However, I recently moved and my new (board certified) cosmetic dermatologist recommended a full-face/neck botox. What is achieved by injecting the hairline, jawline, neck & chin? After 3 weeks, I'm happy with the results with the exception of under my chin/jaw. I appear to have what I call the "bullfrog" when talking/laughing. Did the botox relax the muscles that prevent the "bullfrog" effect?