Would it be good to get Botox in this area?

Whenever I eat, the temple area shown in the photo bulges out, and it feels like the muscles in that area are gradually getting bigger. I also experience severe muscle pain and headaches. What are the potential side effects of getting Botox in my temples? It isn't very visible in the photo, but that area gets incredibly large every time I clench my teeth. What would be the recommended dosage? Also, I understand that Coretox and Xeomin have a low risk of developing resistance; is the probability of developing resistance lower for Xeomin?

I would appreciate any advice from those who have received Botox in their temples. Please also let me know your recommended dosage and product. Lastly, I had my last injection in mid-May; when is it safe to start getting more?