This is a set of 3 pairs (6 pieces total) of mouthguards. There are no instructions included, so please use the following 【How to Use】 as a reference. 【How to Use】 1. Warm the mouthguard in 90-100°C (194-212°F) water for 5 seconds. (The softening temperature varies depending on the season.) 2. Remove from the hot water and let it cool for 10 seconds. 3. Press firmly onto your teeth to create a mold. 4. Trim off any excess material with scissors to shape. 3 sets, 6 pieces, mouthguards, upper and lower sets, for teeth grinding, orthodontic use ※ We are not responsible for any burns or injuries resulting from improper use. Please use at your own risk. ◆Notes◆ All items are shipped via "Mercari Delivery," which offers tracking numbers, anonymous delivery, and fast arrival for peace of mind. 736LOVE6☆New Mercari Delivery