Brand New1. Material: FDA grade silicone2. Non-toxic， double protect teeth when training3. adult's sizeColor: clearFitting Guard:Have a container of cold water ready， next to pot of boiling water. Immerse mouthguard completely in boiling water for 35 seconds.Remove mouthguard from boiling water， and dip into cold water for an INSTANT. Remove quickly and place over upper teeth.With mouthguard in proper position， immediately place tongue against roof of mouth， and with strong sucking motion， suck out all excess water and air.Bite LIGHTLY with back teeth.Remove carefully from mouth and put into cold waterAfter mouthguard is chilled， check fit. If tighter fit is desired， simply remold by following steps 1 to 5