Professional teeth whitening trays
Professional whitening trays are custom-fitted appliances that hold peroxide gel evenly against the visible tooth surfaces.
The short answer
Professional whitening trays are custom-fitted appliances that hold peroxide gel evenly against the visible tooth surfaces. A dentist checks the teeth and gums first, then supplies trays and instructions for the prescribed gel and wear schedule.
What is the direct answer?
What does this question mean?
The trays are made from a thin dental plastic moulded to your teeth, rather than being a universal strip or loose mouthguard. Carbamide peroxide or hydrogen peroxide moves through the enamel surface to break down some stain molecules; fillings, crowns, and veneers do not bleach.
What can you do next?
Have a dental examination and cleaning if needed before whitening, and report cavities, cracked teeth, gum recession, or existing sensitivity. Use only the prescribed amount in the tray, keep gel off the gums, follow the wear time, and stop if pain or gum irritation persists.
When should you seek dental care?
Arrange an examination before treatment if a tooth is painful, has a dark internal colour, or has an untreated hole. Contact the dental team if the gums turn white and sore, sensitivity is severe, or symptoms continue after the trays are removed.
What should you ask the dentist?
Ask whether the colour change is surface stain or a change inside the tooth, whether existing restorations will match afterward, and which gel concentration and wear schedule fit your teeth. Also ask how to clean the trays and manage sensitivity.
Frequently asked questions
Can whitening trays whiten fillings?
No. They can lighten some natural tooth structure, but fillings, crowns, and veneers keep their existing colour.
Why do my teeth feel sensitive in trays?
Peroxide can temporarily irritate the tooth nerve or exposed dentine, especially when the tray is overfilled or worn longer than prescribed.