The Sentinel Dual Laminated Dental Night Guard® Constructed with two layers, a soft layer on the inside and a hard outer layer, the dental night guard is semi-flexible. Used for: Protection against excessive teeth grinding and jaw clenching (bruxism) Relieves: Teeth and jaw pain Headaches associated with bruxism Teeth breaking, cracking Teeth sensitivity Promotes: Better sleep Better health Material used: Ethylene Vinyl Acetatet (inner soft layer) Copolyester (hard outer layer) Free from BPA, Silicone, Phthalate, Latex, MMA Additional information: 90 day satisfaction guarantee 1 year replacement warranty if your grind through your night guard