If I get jaw Botox consistently, will the improvement in my square jaw really be maintained?

Hello! My face shape isn't naturally very angular, but perhaps because of my habit of clenching my teeth, I feel like my jaw muscles are gradually developing. I have a habit of grinding my teeth when I'm stressed or concentrating, and at some point, I noticed my jaw area starting to feel a bit hard.

I'm self-conscious because my jawline looks wider in photos, especially from the side, than from the front. I feel like my face used to look a bit softer, but lately, my lower face feels heavier for some reason. When I actually look in the mirror and clench my teeth, I can feel the muscles on both sides of my jaw bulging out, so I realized, "Ah, these are real jaw muscles, haha."

So I'm looking into jaw Botox, and I've found that a lot more people get it than I expected. The price is relatively affordable and the procedure is short, so many people recommend it as an entry-level treatment, and I'm actually tempted. However, what I'm curious about is how the effects last.

I'm curious about when it starts to slim down after just one session, and how long the results usually last. Also, I've heard that if you get treatments consistently, your muscles gradually shrink, causing the gaps between sessions to lengthen over time; is that true? On the other hand, I've also seen comments saying that getting treatments for a long time can cause sagging cheeks, so I'm a little worried.

If anyone has been getting jaw Botox regularly, I'm curious about your satisfaction level. Please let me know if you feel your facial contours are becoming more defined—even if not a dramatic change—and if you experience any discomfort while chewing.