Mouthguards should be used in contact and non-contact sports to reduce the risk of concussion and mouth related injuries. The thickness of a mouthguard determines its effectiveness. The thickness of the cushion between the upper and lower jaw is the critical criteria in purchasing a mouthguard. The boil time is directly related to the thickness. Our NEW 35 second boil mouthguard is 240/1000 of an inch thick. $100.00 per tooth warranty. 25 per pack. Available in Black, Clear, Gold, Royal, and Scarlet. Junior sized for youth 10 years and younger.