Mouthpieces Set of 2 large and 2 small Can be used for a variety of purposes, including teeth grinding, snoring prevention, martial arts (sports mouthguards), and whitening. 【Safe and Secure】 These mouthpieces are BPA-free and made of materials that do not affect the human body. They are molded with hot water, so they are always clean. 【Molded to Fit Your Teeth】 The main feature of these anti-snoring mouthpieces is that they are molded to fit the individual's teeth. By softening them in hot water and fitting them perfectly to your teeth, you can create a mouthpiece that is uniquely yours. 【How to Use】 Easy! 4 STEPs! Customize to your teeth with the original molding method. ① Wash the mouthpiece thoroughly with a toothbrush, etc. ② Put the mouthpiece in 70-75°C hot water for 30-40 seconds. ③ Put the mouthpiece in your mouth and bite down firmly. ④ Remove the mouthpiece from your mouth and cool it with water to complete. 【Precautions for Use】 Before and after use, wash the mouthpiece thoroughly with water and keep it clean. After washing, dry it in the shade and store it in the dedicated storage case when not in use. If you experience extreme discomfort or any abnormalities in your mouth, please refrain from using it.