so i recently just got my braces off and they gave me my plastic removable retainers and they also gave me these plastic chewies to help me get the retainers in properly... i just put my retainers in after lunch and used the chewies and i heard a crack near the back of my retainers...
the retainers aren't broken but they do have a small crack... would i need to take them back and get them replaced? (I'm under NHS)