Tip: Dear buyer, due to lighting effect, monitors brightness, manual measurement and etc, there could be some slight differences in the color and size between the photo and the actual item. Sincerely hope that you can understand Thank you : Before and after using them, please clean them with a toothbrush in cold or warm water, do not use hot water Then put them in a clean box. Easy to use: Generally, users are required to wear orthodontic braces for 1- 2 hours during the day and 8 hours at night. material: food- grade organic silicon material, safe and healthy. : These orthodontics are of good quality, but dont bite them to avoid deformation. Product The tooth fixture can be used for irregular teeth, wide interdental gap, simple, practical and effective tooth correction. Features - Color: Random. - Material: Silicone. - Dimension: About 5. 7x4. 7x2. 4cm. Package Including 1 x Invisible Orthodontic Retainer Orthodontic Teeth Alignment Trainer Teeth Straightening Orthodontic Retainer Teeth Orthodontic Retainer for Adult Teeth Care