Thank you for viewing! ('◇')ゞ This popular item is not subject to price reduction. This is a set of 3 pairs (6 pieces total) of upper and lower mouthpieces. There are no instructions, so please refer to the following [How to Use]. [How to Use] 1. Warm the mouthpiece in 80°C (176°F) water for 5 seconds. 2. Remove from the 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. Please use at your own risk. 736 Sachi 15.