Will my smile go back to normal after jaw muscles Botox?

As the Botox wears off, your smile will correct itself. You will probably notice gradual improvement even before the 3 to 4 month period of typical Botox longevity. 

There are 2 methods of injecting the masseter and the medial injections if done may affect the smile. Once this wears off and you want it done again talk with your doctor about not injecting the medial sites

Botox generally lasts between 3-4 month. It blocks the ability for the muscle to contract.  The amount it does that has to do with the amount of Botox used.  With the area you are speaking of it is generally a fairly high dose of Botox. The effect will wear off in time and you will regain your original smile.  I would discuss your concern with your injector prior to your next treatments. Good luck with you treatment.

Hi MQA, Botox is a neurotoxin that temporarily blocks the synapses so that muscles don't contract. The duration is only between 3-6 months. In fact, the muscles gradually regain mobility even before it gets back to its original state.No worries, you'll get your smile back.All the best, Justin Harper, M.D.