How much ever you are regular with brushing and flossing of your teeth, certain foods like coffee, tea and red wine do leave a mark on your teeth. Tooth discolouration can be easily treated in less than 30 minutes with the advanced zoom whitening. You can get as much as 2 to 3 shades lighter than your colour. It is safe and absolutely non invasive. It is one of the best possible/ easy cosmetic treatments. Side Effects- The teeth can be sensitive and there are some precautions which need to be taken after the treatment. But, all this lasts for only 24 hours.