Prepare a bowl of 80C~90C hot water, put it in the hot water for 5-15 seconds, and remove it from the hot water when the tray begins to soften. Drain the hot water and place the tray in your upper teeth, bite the front of the tray against your upper teeth with your fingers up and down (press your tongue to the roof of your mouth to suck out excess tray water and air, being careful not to bite through the tray), Hold this position for about 15 seconds to place the tray. Next, make the lower tray this way. Due to different monitors and lighting effects, the actual color of the item may be slightly different from the color shown in the picture. The above product specifications and dimensions are for reference only, manual measurement is allowed, and the error is 1-2 cm. Quantity shipped: 3 piecesProduct color: transparentProduct size: 65*71*14mm