Material : Rubber Full Mouth Protection Soft gel inner layer More rigid outer shield for ultimate impact protection Semi round : 4.7inches A teethguard is a protective device for the mouth that covers the teeth and gums to prevent and reduce injury to the teeth, arches, lips and gums. Depending on application, it may also be called a mouth protector, mouth piece, gumshield, gumguard, nightguard, occlusal splint, bite splint, or bite plane. Brand No Brand SKU 100243328_NP-1020505395