Product 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. The first stage is soft used to fit the appliance and improve breathing habits and to correct the tooth surface. The second stage is hard and is used for further correction to correct the teeth root and teeth fixed and to act as a retainer.Our products are made with the highest quality materials and are designed to provide you with the best possible user experience. We strive to ship out all orders within three days of purchase, and the estimated delivery time is 8-15 days.When shopping, please pay attention to the size and dimensions of the product to ensure that it meets your needs. In the title and , we have provided detailed information about the product, including its features and specificationsWe want you to be completely satisfied with your purchase, so if you have any questions or concerns, please don't hesitate to contact us. We are here to help and will do our best to assist you.Thank you for choosing our product. We hope you enjoy it