Heavy Duty Teeth Protection, Comfortable, Hygenic, Remoldable. Protects teeth with a comfortable fit. Contents: (1) Large Mouth Tray, (1) Small Mouth Tray, (2) Heavy Duty Mouth Guards, (1) Storage Case. Each Mouth Guard is moldable and trimmable to fit any mouth size. Can be used as a 2-in-1 Mouth Guard, Teeth protecting night guard, or Teeth whitening tray. These are the most comfortable dental protectors you can buy. How to use the product: 1. Boil water in a pot and remove from heat for 1 minute. 2. Use a large metal spoon to completely submerge the heavy-duty mouth guard in water. Let sit for 20 seconds (no more than 25 seconds). 3. Remove the mouth guard from the pot and place on a paper towel. 4. After 3 seconds, pick up the mouth guard and place it on the top row of teeth. 5. Once secure, gently press upward with your thumb to create a mold around the tooth. 6. Then close your mouth and use your sucking sensation to create a snug fit. Congratulations! You have completed the molding process for the M3 Naturals Heavy Duty Mouth Guard.