Zoom whitening should last for years, provided you have regular dental checkups and have your teeth professionally cleaned, which helps to remove some surface staining. Eventually, your teeth will begin to discolor again, but this does depend on your lifestyle choices. Refraining from eating and drinking highly colored foods and beverages will help prolong the effects, as will quitting smoking. We can advise you on how safely you can top up the results so you can always enjoy a whiter smile.