You receive: Each package contains 15 teeth whitening mouth trays and 1 mouthguard retainer box, enough to cover your daily use and replacement needs. Required material: This mouthguard is made of high quality EA silicone materials that are safe and comfortable, have no odor, the smooth surface won't scratch your teeth or gums, and the retainer box is made of approved PP which is safe and sturdy. won't break easily and give you a good user experience. Multiple functions: These reusable mouth trays can be widely used for teeth whitening, teeth whitening, teeth grinding, and teeth protection that can conform to most people's tooth shape and will not deform easily, protect your teeth well, and reduce the noise during the process Reduced use. Practical and portable: You can put the whitening trays in warm water for about 15 seconds, then take them out and put them on, the tray automatically shrinks to fit your teeth, very practical and easy, and the mouthguard box is portable so you can have bags or bags for travel can use. Easy to clean: These tooth whiteners are reusable and easy to clean, just soaking them in clean water is enough, please remember to replace new ones after using them for 3-4 months.