[Botox] Chin Botox 3rd session review

I got my first chin Botox in Gangnam in January 2016. I got it with a domestic product and was satisfied with the effect. I don't have a wide chin nor do I have a lot of muscle, so my chin wasn't very wide, and the effect was just that it became slimmer. After that... I heard that I had to get it every 6 months... (I'm sure this varies from person to person ㅡㅡ) I didn't get it, but 8 months later, around September, I got the chin Botox again. This time I got it at a clinic in Myeongdong. As expected, I was satisfied with the effect... And I didn't think anything of it, and then I felt like my muscles were building up a little. My cousin and I got it at a similar time. My younger brother went for another dose as soon as he was 6 months old, and I got another dose 7 months later. The 1st and 2nd treatments were different medicines, and the 3rd treatment was the same Botox as the 2nd treatment. Maybe it's because I got the third shot too early... (the doctor even told me to think of it as a preventive measure because my muscle mass is low), and my chin is about to become dented ㅡㅡ; My muscles are gone;; The area just below the cheekbones has sunk in,,, I'm glad I'm a man ㅡㅡ With Botox, the muscles come back later anyway... so I'm not worried... But... Botox is only used once a year by changing products, or once a year and a half depending on the condition. I think I only need to get it once. I got it about 8 months between the first and second shots, and I think it will be easy for a year and a half after that. I went because the clinic kept texting me saying I could get Botox, so I was wondering if I should go, but I guess that's because there aren't that many. I should have held it longer...