Hello! Welcome to our store! Quality is the first with best service. Customers all are our friends. Fashion design,100cm Brand New,high quality! Description: 100cm brand new and high quality Specifications Material: Food-grade Silicone Color: Clear Size: 6.5 x 6 x 1.3 cm / 2.55 x 2.3 x 0.51 " Great to prevent teeth grinding at night and whiten teeth Quantity: 1PCS x Mouth Tray (If you need upper and lower teeth, you need to add 2PCS to the shopping cart.) Usage instructions 1. Place the tray into hot water about 70C for 10-15 seconds to soften and remove from the water 2. Place the trays into your mouth and press the bonding surface of tray and gum. The tray is now moulded 3. Cut the extra at the impressed gum-line and finish making the tray Note 1. If the tray is not made well, you can repeat the process for the second mould. 2. Please clean the tray with water before using. 3. The replacement time of the trays is 3-4 months. 4. It is normal to feel discomfort for the first time to wear the tray. You will get used to it after several times. 5. 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. Thank you! 6. Please allow 1-3mm measuring deviation due to manual measurement. Please note that slight color difference should be acceptable due to the light and screen. There is 2-3cm difference according to manual measurement. please check the measurement chart carefully before you buy the item. 1 inch = 2.54 cm