mouth guards for teeth grinding,4pcs dental night protector for bruxism clenching,tmj,snoring,no color additive,custom fit hain <b>note:</b><br> 1.rinse with cold water before use.don't use the hot water or the mouth guard will be deformed because of the high heat.<br> <b>how to use?</b><br> 1.you can drink some water avoid the mouth dry before wear. please close the mouth to avoid the teeth guard running out when you use.<br> 2.you need 3 to 7 days to adapt to the mouth guard. slobber,tooth pain, sick are the normal phenomenon.< br>