Often teeth become darker and more yellow as part of the ageing process. Teeth whitening using carbamide peroxide gel is a treatment only provided by registered Dentists. The whitening gel produces a safe, and long lasting whitening of your teeth to produce a more youthful and attractive smile. The process involves having a mould taken of your teeth to produce a gel tray which is filled with the whitening gel and comfortably fits over your teeth while sleeping. Optimal whitening of the teeth is usually achieved after 2 weeks of treatment.