Staff Answer
Sep 11, 2026 - 12:08 AM
Thanks for your questions, happy to clear this up.
Whitening trays versus retainers: the trays in the Teeth Whitening Kit are thin, custom-fitted bleaching trays made to hold the gel evenly against your teeth during a whitening session. They are not retainers, so they are not made to hold your teeth in place or to protect them from grinding. If you want something that does that, the Night Retainer (1 mm thick, a retainer and night guard in one) or the Clear Teeth Retainer (0.75 mm) are the products for the job, and both come as a single arch or as an upper and lower set.
What is in the kit: the at-home impression kit with prepaid return postage, custom-made whitening trays for your upper and lower teeth made from those impressions, and the whitening gel. We do not sell the gel on its own, but gel refills are available at a discount through Subscribe and Save on the product page.
How long the gel lasts: the gel supplied covers your initial course. Most people see a noticeable result in about 9 days, and the results last up to a year with minimal top-ups. If you would like the exact number of applications in the current kit, email us at support@mymofosmile.com and we will confirm it for you.
Sensitive versus standard: the standard Teeth Whitening Kit uses a 6% hydrogen peroxide gel. The Sensitive Teeth Whitening Kit uses a gentler formula and trays designed for people who normally get sensitivity from whitening. If you already know your teeth are sensitive, the Sensitive kit is the better starting point. For anything specific to your own teeth, please check with your dentist or email us and we will help.
Whitening trays versus retainers: the trays in the Teeth Whitening Kit are thin, custom-fitted bleaching trays made to hold the gel evenly against your teeth during a whitening session. They are not retainers, so they are not made to hold your teeth in place or to protect them from grinding. If you want something that does that, the Night Retainer (1 mm thick, a retainer and night guard in one) or the Clear Teeth Retainer (0.75 mm) are the products for the job, and both come as a single arch or as an upper and lower set.
What is in the kit: the at-home impression kit with prepaid return postage, custom-made whitening trays for your upper and lower teeth made from those impressions, and the whitening gel. We do not sell the gel on its own, but gel refills are available at a discount through Subscribe and Save on the product page.
How long the gel lasts: the gel supplied covers your initial course. Most people see a noticeable result in about 9 days, and the results last up to a year with minimal top-ups. If you would like the exact number of applications in the current kit, email us at support@mymofosmile.com and we will confirm it for you.
Sensitive versus standard: the standard Teeth Whitening Kit uses a 6% hydrogen peroxide gel. The Sensitive Teeth Whitening Kit uses a gentler formula and trays designed for people who normally get sensitivity from whitening. If you already know your teeth are sensitive, the Sensitive kit is the better starting point. For anything specific to your own teeth, please check with your dentist or email us and we will help.
