that is because those migraines are not produced by teeth grinding. Then they inject it in the muscle that produces the tension an migraines. On the other hand, Allergan botox is injected in masseter for a different indication, which is Bruxism. it is very commonly used for this indication. Bruxism can produce migraines or not, but what does, is to break teeth because of the masseter tension when sleeping and also the injection and masseter relaxation produces a "beauty" effect because re-shapes the jaw area, creating a "beauty" effect and more harmony in the face shape. It is quite popular procedures in aesthetic clinics. See as an example this picture: http://www.clinicamurano.cl/wp-content/uploads/2017/03/bruxismo-2.jpg
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