There are several procedures available that correct discoloration of the teeth by removing the brown and yellow stains. You should discuss with your dentist to could recommend you the most appropriate yellow teeth whitening procedure. The latest procedure for yellow teeth whitening is the  in-office bleaching system which uses laser light along with a whitening gel. The laser light is used to activate the crystals of the gel applied on your teeth by absorbing energy from the light. This energy penetrates the teeth enamel and increases the lightening effect on the teeth. Though it is the quickest procedure, it is an expensive treatment.