My first petit procedure was botox, and at first I only got botox for my jaw! But it’s true that my masticatory muscles are quite developed, so the effect was really good . After that, I got it 3 more times every 1-2 years, and the muscles definitely shrank a bit. I got it too often because I was lazy, but if you get it a few times every 6 months, it seems to last well after that. I got it recently for my forehead, and it lasted about 5 months? I’m going to get it again. ㅎㅎ