Boil tw to three cups of water in a medium-sized saucepan over high heat.
Fill a bowl with cold water and place it on a kitchen counter near the stove.
Lower the Riddell mouthguard into the boiling water and hold it three for 30 seconds. Do not turn off the heat under the water.
Remove the mouthguard from the water and immediately lower it into the cold water for one second. Do not allow the mouthguard to remain in the cold water for any longer than one second.
Insert the Riddell mouthguard into your mouth, making sure that both the upper and lower section are resting on the upper and lower teeth.
Gently press the upper section of the mouthguard into the upper teeth to mold the upper section.
Close your teeth and bite down gently to form the lower section.
Remove the mouthguard and lower it back into the boiling water for two seconds with the tongs.
Shake off the mouthguard to remove any excess liquid and quickly place it back into your mouth.
Gently close your teeth and with your index finger, mold the shape of the Riddell mouthguard underneath your cheeks and lips.
Remove the mouthguard and hold it under a cold tap for 10-15 seconds.