While I don't believe that “exercising” your jaw by chewing hard foods such as carrots will make your Botox treatment less effective, I would advise you to avoid doing anything to build up the masseter muscle again. First, we do ask our patients to refrain from exercise for 24 hours after Botox – no matter where they're treated. Second, giving your jaw a “workout” by eating difficult, chewy foods may build up that masseter muscle that you just used Botox to slim. Feel free to eat normally, but limit chewy bagels, dried sausage, jerky, gum and yes, hard carrots – anything that could begin building up the muscle again. Please see a board-certified dermatologist to have your jaw slimmed with Botox.