Dear Enracy,Botox® can be a wonderful way to shape the lower third of the face by injections into a large hypertrophied masseter muscle. The Botox® will relax the masseter muscle, slimming the lower jawline and creating a more oval shape to the face in those individuals who are square-jaw dominance as the presenting phenotype. As long as the masseter Botox® is performed judiciously and the function of the masseter is not impeded, there should be no contraindication to get braces or dental work done following the procedure. I have been performing Botox® injections for over 20 years and masseter shaping is an important part of intervention for many patients with square-dominant lower thirds. To find out more, please refer to the link below.I trust this information has been of some assistance and best of luck. Sincerely,R. Stephen Mulholland, M.D.Certified Plastic SurgeonYorkville, Toronto