Feature 100% brand new and high quality Patented Adjustable Design Comfortable & Form Fitting Dentist Recommended How it Works This is a self molded retainer that is FDA-cleared to reduce snoring by holding your lower jaw Slightly forward of its normal position while you sleep. It opens your airway and eliminates the vibrations we all know as snoring. No vibrations, no Snoring Customized for Comfort. Ready in minutes. The device has an upper and a lower piece that you can join together in three settings, Depending on your bite. After the pieces are connected, the device is boiled to soften the Material so that You can mold it perfectly to your teeth in less than a minute. Its that easy Custom Fit Instructions: Boil water (about 70-80 degree C). Turn of the heat and put mouthpieces in the hot water after attaching them in the desired Position for about 15 seconds. Remove the mouthpiece from the water and shake off the excess water and insert the Mouthpiece into your mouth. Adjust the mouthpiece to a comfortable position and then bite Down - use your fingers to move the mouthpiece around the front and sides to make a good Mold of your teeth. Remove from mouth once you feel that all your teeth have left good impressions. Put the molded mouthpiece into cool water. Packcge Includes: 2Pcs/box Stop Snoring MouthPiece Grind Note: 1.Please allow 1-3mm error due to manual measurement. 2.The color may be different with the true item due to the screen display, pls understand.