How long does it take for Botox to work in reducing the jawline for face slimming if its the 1st time I have used it?

It takes a week for Botox to relax the muscle, then several more weeks for the muscle to begin to become smalller.  I do not think there is enough fat to reduce the size of the jaw with Smart Lipo significantly unless one is overweight.You will want to repeat the treatment every 3 to 6 months, doending upon the dose used ( higher doses last longer).The price you paid sounds reasonable since large doses must be used in large masseter muscles, but this would depend upon the number of units used.

Unlike regular wrinkle injections, the effect of injections in the masseters takes about 4-6 weeks before you see the difference and typically last between 4-6months before needing another treatment. 

Thank you for your question. Botox in the masseter region usually takes longer than in the standard areas to take effect. I tend to use anywhere from 15 units (conservative treatment) to 50 units (for someone with really strong masseters) on each side to get the desired result. It may start within the first week but I tell my patients to wait three weeks before doing a more thorough evaluation. The treatment typically lasts longer than the forehead/crows feet/frown regions. It is also a gradual onset of the return of masseter function. I have tried the masseter injections myself and space the treatments around 4 months apart, but use smaller doses to maintain the effect. I normally know the effects are wearing down when I start to clench my teeth more heavily at night when asleep. Once you stop using Botox, the masseter muscles will return to their original baseline when the effects of Botox wears off completely.