My skin is sagging around the jaw line and I'm looking for advice on best treatment for tightening this area. I am in my mid 40s and the skin sagging at the jaw line is probably due to a combination of ageing and weight loss. I have been considering a treatment to tighten the lower part of my face such as Facetite, ultherapy, Ultracel or HIFU. I have received conflicting advice and find the information available online confusing. Which of those 4 treatments are likely to bring the more significant improvements and the longer lasting results?