I am considering getting square jaw Botox.

Hello. I am posting this because I am under a lot of stress lately due to my square jaw every time I look in the mirror. My bone structure doesn't seem particularly large, but the area below my ears and jawline stands out especially prominently, making my face look wide and flat. I am afraid of the cost and the long recovery period for surgery, so I simply cannot bring myself to consider it. Therefore, I am considering a relatively simple square jaw Botox procedure. When I clench my molars tightly, I can feel the muscles at the back of my jaw becoming hard. In this case, would the effects of square jaw Botox be dramatic? I am also curious how long the effects of Botox usually last. I read that you need to get injections regularly to maintain the results, but I am worried because I also heard that frequent injections can lead to resistance and eventually render the treatment ineffective..ㅠㅠ I would appreciate any advice from those who have undergone Botox after similar concerns!