Matters needing attention 1. Do not put it in hot water above 70 degrees and deform it at the same time. 2. At the beginning of use, some people will suffer from drooling, toothache, nausea and other symptoms. This is a normal reaction and can be adjusted for a period of time. 3. Close your mouth naturally when using. Do not chew hard. 4. Do not use dentures or implant dentures. 5. Do not use for serious tooth problems such as severe tooth overlap and flaring. Suitable for children between 6 and 15 years old. Wearing time: 1-2 hours during the day and 8 hours at night. Package:1 pc Note: 1,Due to the influence of light, environment and display screen when taking photos, there will be some color difference between products and pictures. Please consider carefully before purchasing. 2,This product is only the product itself, not include the decorations in the picture.