Slimming wide face on a male? Do you think botox to the masseter muscle can help? (Photo)

Using Botox to relax the masseter
muscle can slim the face. Fillers in the chin might help. Please see an expert. Best, Dr. Emer

You've got most of your facial features redacted in your photograph - but in general, bi-mandibular facial width can be reduced with Botox to the masseter muscle - I do this frequently for Asian patients - we usually use about 40-50 units per side and patients see nice results several weeks post injection. 

if achieving a less round, more masculine jawline, is your goal, I would not recommend a bone reshaping procedure. You can certainly try Botox to the masseters as that will weaken the bulk of soft tissue and many are happy with that. Understand however, that results from Botox are subtle, temporary and can be expensive over time.