How Long Does Botox Take to Work in the Masseter Muscles?

Botox can take from a few days to two weeks to start working. For masseter reduction, it is dependent upon number of units you were treated with and what sort of expectations you have and discussed with your provider. It can take several months, and you need to continue treatment to maintain the reduction.

The Botox will take effect within 2 weeks after injection. Once the masseter muscle has completely relaxed, the reduction of the muscle will occur over the following 2-4 weeks. Most patients notice changes at the 1-2 month follow up.

 

Repeat treatments help to maintain results and prolong duration of effect.