I tried to correct a crooked tooth 4 years ago. To be honest, I thought my teeth were fine, but my mom told me to do it ㅠ (No extraction) The dentist itself is huge and there are many people, so even a simple checkup if the appointment time is late, you have to wait. And honestly, I didnt feel like I was being looked after meticulously, probably because I was busy. After two years of full correction, the retainer didnt fit well, so my teeth were misaligned a lot.