Your braces will cause uneven whitening when using our Teeth Whitening Kit so you will need to wait for these to be removed first. Until then the Day & Night Toothpaste is the best option for protection from further staining.
You may be able to use the Teeth Whitening Kit with a retainer, however this depends on the sort of retainer you have. We encourage you to speak with your dentist prior to using HiSmile.