Are there any side effects of sunken cheeks after square jaw Botox treatment for men?

Hello, I am a male office worker.

I tend to grind my teeth, and my jaw muscles develop when I chew food, so I am considering square jaw Botox. Whenever I look in the mirror, the muscles along my jawline below my ears appear to protrude, making me feel like I have a fierce impression.

I heard that getting jaw Botox at a dermatology or plastic surgery clinic reduces muscle size and slims the jawline. However, after looking at online reviews, I saw reports of side effects where fat was lost in the temples or cheeks, causing hollowing out of the cheeks, so I am a bit hesitant.

I am curious if men can get this injection and achieve a natural-looking line without it appearing awkward. If anyone has received the injections and is maintaining the results without any side effects, please share your experience.