Anyone who has seen the effects of Botox for droopy corners of the mouth?

I think the cheeks are the first area where a loss of facial elasticity shows up. Drooping corners of the mouth and deep cheek fat forming... Because of this, if I don't smile broadly when taking photos, I look depressed and older. But then again, I can't just smile broadly whenever I want. I often have a blank expression in daily life, and it annoys me to be asked if I'm okay every time. I also hate looking dull when I look in the mirror! So, I'm planning to get Botox to target the muscles causing the corners of my mouth to droop, and use a laser lift to address the deep cheek fat caused by overall loss of elasticity. Is it true that Botox is effective for correcting the corners of the mouth? If you have seen results from lip corner Botox, please tell me how long the effects lasted and if you experienced any side effects. Also, if anyone knows of any lifting procedures that pair well with lip corner Botox, please don't hesitate to give me lots of recommendations and advice.