How to mould a mouth guard

Updated March 23, 2017

Moulding a mouth guard is the process through which the mouth guard is customised to fit in your mouth. The mouth guard is meant to protect the teeth and jaw of an athlete who might get hit in that area. A mouth guard can be custom fit by a specialist or you can mould a store bought mouth guard so it will easily fit in your mouth. Some players do not like using a mouth guard because it can be uncomfortable, but moulding the mouth guard to the specifics of your mouth will help to ensure comfort while providing safety.

Fill the pot up with water and bring it to a boil. Drop the mouth guard into the boiling water. Let it simmer in the water for 30 seconds. Boiling it for much longer than 30 seconds will melt it and boiling it for much less than 30 seconds will not render it pliable enough.

Fill up your cup with cold water. Remove the mouth guard from the boiling water with your tongs. Be careful not to drip hot water on yourself when removing the mouth guard. Place the mouth guard in the cup of cold water. Leave the mouth guard in the cup of cold water very briefly, no more than three to five seconds. The cold water is used to bring the temperature of the mouth guard's surface down to a temperature that is tolerable.

Remove the mouth guard from the cold water and quickly place it in your mouth. The plastic of the mouth guard should still be warm as it just came out of the boiling water a few seconds ago. Bite down on the mouth guard for about one minute to mould the mouth guard into the shape of your teeth and mouth. Biting down will let the mouth guard mould to your mouth while it cools. After one minute, remove the mouth guard and place it back in the cup. Allow five minutes in the cup for the mouth guard to completely cool and set.


If you are not satisfied after your first attempt repeat the process to remould the mouth guard.


Boiling for too long will cause the mouth guard to melt and turn it unusable.

Things You'll Need

  • Pot
  • Large cup
  • Tongs
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About the Author

Tyler Ellington is a freelance journalist whose work consists of a wide variety of topics. A freelance journalist since 2007, Ellington typically spends most of his time writing about sports, business and technology. His work has appeared on various websites. He earned his master's degree from California University of Pennsylvania.