What you will need:

Hot – but not boiling – water (160 °F)
Fork or similar utensil


1.Wash your hands and the material with soap and water.


2.Heat water in a small bowl to approximately 170 °F/ 77 °C
(hot to the touch, but not boiling).

3.Place your SISU 3D Mouthguard into the hot water and wait until it becomes soft and pliable (use a fork or other utensil to determine mouthguard softness). It’s essential that you do not let the softened guard fold on itself. The material will glue together, making it difficult to reshape.


4.Holding the mouthguard with both hands, carefully insert the mouthguard. Make sure the back inner ridge does not fold in on itself. Bite down gently – do not make deep teeth marks.

Step 4 - Mold your SISU
Step 5 - Check your fit

5.Once your SISU is in the proper position, close your lips over the guard and put your tongue to the roof of your mouth. Gently create suction by swallowing until the material has hardened to a snug, perfect fit. Keep the mouthguard in your mouth for 3-5 minutes to allow the shape to set. After the guard is set, it should be snug enough that it won’t come off your teeth without using your fingers to “help” remove it.

Did you mess up? Unhappy with your fit? Had so much fun that you want to do it all over again? NO PROBLEM! Every SISU guard is remoldable up to 20 times. Simply place your molded mouthguard back in the hot water, let it soften, and there you go! Time for Round 2.

Here’s a list of things to consider when fitting your SISU!


Use water that is hot to the touch to activate your mouthguard

Double check that the bottom of your front teeth are lined up with the bite pad.

Suck in air gently, creating a snug but comfortable fit that stays in place while speaking.

Don’t do this:

Use boiling water to mold your SISU!

Stretch the material because the mouthguard will tear. *Do not use mouthguard if damaged.

Suck in air too vigorously, creating a fit that is too tight.

Bite down too hard or create deep bite marks in the guard.


Check your fit:

So you've fitted your SISU, and you're ready to hit the field...not quite. Once you've fitted your SISU Mouthguard it's important to check to make sure that it's fitted properly. A proper fitting guard is essential for the Diffusix Technology in the mouthguard to function.

  1. Does your guard cover the outside of your teeth?
  2. Is your mouthguard snug enough that you need your hands to remove it?
  3. Are your teeth lined up on the solid bide pad, and not on the perforations?
  4. Can you clearly say “SISU”? If “no” to any of the above, start back at Step 1 and remold. SISU mouthguards are remoldable up to 20 times!

Should you encounter a problem at any point during the fitting process, please contact our team at customerservice@sisuguard.com