Purchased on Amazon for 2200 yen. Brand new, unused, unopened. Please read the profile before purchasing. [Mouthpiece for Bruxism and Clenching] Bruxism and clenching can not only chip, crack, and wear down teeth, but also cause poor physical condition in the head, shoulders, and neck. With a mouthpiece, the burden on the teeth and jaw is reduced, and shoulder stiffness and headaches caused by bruxism are also alleviated. [One-Touch Installation] Installation is as simple as biting down to fit the molars, thanks to the tooth pressure absorption structure. Simply wear it at night to absorb and disperse tooth pressure, stopping it perfectly without putting stress on the molars and jaw. The wave shape fits the molars, making it discreet, so you can use it with confidence when staying overnight or traveling. Anti-Bruxism Mouthpiece, Set of 2, with Dedicated Case, Easy to Install Without Molding! Effectively prevents nighttime bruxism and clenching, supports comfortable sleep, unisex. - Product Name: Anti-Bruxism Mouthpiece - Quantity: 2 pieces - Material: Uses antibacterial material - Features: Soft and comfortable to wear ※ The color of the main body will be random and may differ from the image.