Are there any side effects from the Botox procedure?

Hello, I am a male office worker.

I am a male office worker seriously considering square jaw Botox because my jaw muscles are slightly developed, making me look like I have a strong impression.

I would like my facial lines to become softer with Botox. Are there any side effects, such as sagging cheeks or unnatural facial expressions?

I am curious about the criteria for choosing a dermatology clinic that performs procedures safely and effectively without worrying about side effects. If any men know of any post-procedure precautions or care tips, please share them.