Doing At-Home Whitening Kits
You can also ask your dentist for an at-home gel treatment. At-home treatment may take longer than the immediate in-office treatment, but it's more convenient and comfortable. For this treatment, your dentist sends you home with a tray that is full of whitening gel. You wear this tray for a set period in the evenings, like while watching TV or reading. You may have to wear these trays for two to four weeks, depending on your dentist's recommendations. However, these trays are typically prescription-strength whitening and can have fantastic results.
There are over-the-counter whitening gel trays available in stores too. Keep in mind that these are not prescription-strength whitening, but you can see results over time.