Instant purchase OK! No price reduction except for multiple purchases! Please comment if you want to purchase multiple items! This is a set of 6 pairs (12 pieces total) of upper and lower mouthpieces. There are no instructions, so please use the following 【How to Use】 as a reference. 【How to Use】 1. Warm the mouthpiece 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 cool for 10 seconds 3. Press firmly against your teeth to create a mold 4. Trim off any excess with scissors to shape ※ We are not responsible for any burns or injuries resulting from improper use, so please use at your own risk. 736 Dora 12☆ New