Features: Made by EVA material, no stimulation to your oral, safe to use. High quality tray ensures up to 3-4 month using time. Used with teeth whitening gel for teeth shining, bleaching purposes. Also great to prevent teeth grinding at night. 5 pieces mouth guards included in the package. How to use: 1. Submerge the mouth trays into over 80C hot water for 5 seconds, remove the tray from the hot water and let it cool for 10 seconds. 2. Place the trays on your teeth to form an impression. 3. Trim the formed trays, cutting at the gum-line. 4. Apply the whitening gel in each tray to whiten your teeth. Note: 1 It is normal to feel discomfort for the first time to wear the tray. You will get used to it after several times. 2. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Specifications: Type: Dental Mouthguard Materials: EVA Quantity: 5pcs. Color: Clear Package Size: 15 x 11 x 2.5cm / 5.9 x 4.33 x 0.98in Package Weight: 35g / 1.23oz Package List: 5 * Thermoforming Dental Mouthguard