This is the easiest, safest and most economical way to improve your smile.
Is it safe?
Yes, millions of cases have been carried out without any problems. As long as the correct material 
(Carbamide Peroxide) is used in the correct concentration in well fitting trays.
How does it work?
Oxygen is released within the teeth removing stains but leaving the teeth unaltered.
Are there any side effects?
10 – 15% of patients can have sensitivity which lasts 24 – 48 hours and some mild pain relief may be needed.
Methods of Tooth Whitening:
At Home Bleaching: This is the method we use. The tooth whitening gel is worn in specially made trays which accurately fit over the teeth at night for a period of 2 – 6 weeks. 10% carbamide peroxide is the material used.
Here is a video from Colgate with an Introduction to Teeth Whitening