1. Prepare a bowl of 80C~90C hot water, put it in the hot water for 5-15 seconds, and take it out from the hot water when the tray starts to soften. 2. Drain the hot water and then put the tray into the upper teeth, use your fingers to press the front of the tray against the upper teeth to bite up and down (and press the tongue to the top of the mouth to suck out the excess in the tray) water and air, being careful not to bite through the tray), hold this position for about 15 seconds to set the tray. Next, in this way, a tray for the lower teeth is produced. 3. Trim the tray and rinse with waterPackaging: Independent transparent OPP packagingWeight about 6G/pcProduct specific size: 65*71*14mmPackage Included:3x gel braces shapeable invisible braces (opp bag)Comment:1. If the product page shows: Ship within 24 hours, it means that the seller must accept and send your package within 24 hours at the latest. However, this does not mean that the package will arrive within 24 hours. 2. In order to deliver your order as soon as possible, we will accept and deliver your package as soon as possible. 3. If you need to cancel the order, please inform in time, please do not inform after accepting the order. 4. Please be aware if we do not accept cancellations after the order has been accepted/posted. 5. Due to different displays and lighting effects, the actual color of the item may be slightly different from the color shown in the picture. 6. The above product specifications and dimensions are for reference only, manual measurement is allowed, and an error of 1-2 cm is allowed. 7. We are foreign sellers. The logistics time varies from country to country, and the specific logistics information shall prevail. Thank you for choosing me