Purchased at the end of August 2025. I started partial orthodontics in April 2025 and purchased this for 90,000 yen at the dentist's office because I wanted to finish quickly. However, I gave up on the orthodontics in early October and stopped using the appliance, so I am selling it. I used it 2-3 times a week. It has been sterilized and is stored cleanly. It looks almost new. Price negotiations are also possible, so please feel free to comment.