Yes, it is recommended that you keep all your receipts regarding cosmetology supplies such as these threads so that if there are any issues with the product, its quality, or its performance you have a valid record to claim their standard warranty conditions. Even though using rainbow PDO thread might be seen as an alternative to surgical treatments available in the market it should always be done under the supervision of experienced professionals who have extensive knowledge about this form of treatment methods speak with several doctors beforehand so make sure that you choose the right procedure for yourself!