Everyone responds differently to whitening treatments and everyone will whiten at different rates. Some stains are easier to treat than others. Teeth that are yellow or brown are easier to whiten than teeth that are gray-ish. Younger patients typically whiten more quickly than older patients, but every patient is different.   When whitening, keep in mind that your smile looks most natural when the color of your teeth matches the whites of your eyes. Some people want a Hollywood white smile, but that is not a natural color for teeth and few people can actually reach that color of white. Compare strengths and wear times for our various Opalescence whitening products and consult with your dentist to help determine the right option for you.