How long do I bleach my teeth ? 

Most dentists advice is that you sleep wearing your bleaching trays ! However this is not needed, Some people can have some temporary sensitivity from over bleaching there teeth by sleeping with them on:

 The best and most practical way of wearing your teeth whitening mouth trays is to start like this : 1'st day of dental bleaching treatment: Simply apply a small dose of gel to the inside of the teeth whtening tray and wear for just 10 mins and stop treatment, then clean and brush teeth. 

2nd day of dental bleaching treatment: Repeat as above but extend the time to 20 mins.

3rd day of dental bleaching treatment: Repeat as above but extend time to 30 mins. Build up wear time to 2 hours slowly over a period of time. You can then wear your trays for upto 2 hours a day for 14 days, this will give you 28 hours wear time, which will be a full course of treatment. 

Teeth whitening tips:

1) Never rush your teeth whitening treatment, it is much better to take it easy.. 2) Do not overfill the trays with bleach, simply use a small dose of dental bleach. 3) Always seek advice from your own dentist before using a dental bleahcing treatment. 4) Get advice and tips from family or friends who have used a dental bleach. 5) Always use a top brand of teeth whiteing bleach like Colgate or SDI polanight teeth whitening. 6) If you feel like you are getting any senstivity then stop treatment and consult with your dentist, senstivity is only temporary for a few days, use sensodyne toothpaste. ( Colgate visible whitening is the best brand to use to prevent senstivity as it contains potassium nitrate the same ingredient as sensodyne !) 7) If you want to know more on tooth whitening then post a question on this group !