Specifications:Non-toxic, no smell.2 mouth trays, one for upper teeth and the other for lower teeth.Great to whiten your teeth, prevent teeth grinding and protect your teeth during sports. How to Use:1. Submerge the mouth trays by placing it into hot water of up to 80& x2103; 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 impression3. Trim the formed trays, then cut the part below the gum line.4. by injecting whitening gel to each tray, you can whiten your teeth. Type: Mouth TrayQuantity: 2 PcsMaterial: EVA Thermoplastic CopolymerNote: Due to the light and screen setting difference, the items color may be slightly different from the pictures. Package Includes:2 x Mouth Trays