The number of treatments needed will vary from one person to the next and depends on severity, and how quickly you respond. The average person will have kybella injections 2-3 times, but occasionally only 1 session is needed, and then there are those who will go beyond 3 session but that is rarely the case. Kybella really does work, and the downtime is relatively short with some swelling, and the occasional bruise and numbness to the area. Most people can go back to the normal routine with 2-3 days, but will still have some swelling at that point, with full reduction of swelling occuring within 7-10 days depending on the case. I will often perform this on a Thursday or Friday so the weekend can be used as a recovery period. Kybella injections are done in 1 month intervals, but can be spaced out further. The results are permanent in the sense that if weight is not gained the fat will not regenerate in this area, but other changes such as skin laxity may occur with aging and this can be treated with tightening procedures such as the Ulthera.