My face looks wide from the front due to my square jaw muscles. Would Botox be effective for this?

I am an office worker who is very concerned these days because whenever I look in the mirror or take photos, my face looks particularly wide and angular, like a square jaw, especially when viewed from the front. Although I have actually lost weight compared to before, my chin line looks heavy and dull—perhaps because the muscles around my jaw are tight—making my impression look harsh. I even wonder if the flesh I feel when I clench my teeth is all muscle. People around me have recommended Botox as the most affordable and safest way to refine my facial lines, with minimal side effects, so I am currently looking into it.

I heard that the principle is to reduce volume by temporarily slowing down muscle movement. I would like to ask those with experience if someone like me, with well-developed jaw muscles, can definitely see the effects of Botox for square jaw correction. I am curious about how long it takes to see a noticeable slimming effect after the injection. I am also a little nervous about whether the procedure involves a dull ache or is quite painful.

Since I am trying to squeeze in injections while working, I am cautious about potential side effects after the procedure, such as a drastic loss of chewing strength that prevents me from eating hard foods at all, or sunken cheeks. There seem to be many types of domestic and imported products; could you please share some tips on which products you all use for regular injections? If anyone has achieved a satisfactory slimmer face for the price, please share some genuine information or advice regarding Botox before I visit the clinic. Thank you in advance for your comments.