The Olympus Sport 4006501 single mouthguard has a single layer of oral-hygiene-safe vinyl and a semi-rigid construction. It is designed for children up to 11 years old and is molded to the teeth by heating it in water.

To fit the mouthguard, bring water to a boil and let it cool for 45 seconds. Place the mouthguard in the water for 90 seconds, without...