Has my dentist given be bad whitening trays?

Thank you for your question. A good way to check if your trays are too loose is to see if they fall off the plaster model that they were made on. This is a check a dental technician and the dentist themselves would / should have done before handing them over to you. Explain the situation to your dentist. Gums should not be hurt during tooth whitening. Good luck with your next trays -Thomas Dey, BDS, MSc

Hello, I would recommend to request a new set of trays. If they are too loose material could be coming out thus decreasing efficacy. Many professional trays can be made in the dental office.