Set of 2. For those concerned about teeth alignment, protruding teeth, snoring, or teeth grinding, or those who want mild orthodontic treatment! It fits gently on your teeth and gums, and you can easily remove it yourself. Material: Silicone Target: For those aged 12 and over Type: Transparent, soft type *Individual differences may occur. Single items and hard types are also available. Thank you very much. Please also take a look at my profile. Instant purchase is welcome(^^) If you wish, we can also offer anonymous shipping (Nekopos), which is faster than regular mail, for an additional 50 yen.