Whitening methods range from powerful gels that can only be applied by a professional to lower-dose products you can use at home

Take-Home Whitening — Your dentist will give you custom-made mouth trays made of thin, flexible plastic that you will fill with whitening gel and then leave on your teeth for a prescribed period of time.
Over-The-Counter Teeth Whitening — These products contain lower concentrations of bleach but can be effective over time if used as directed..
Whitening Strips — These resemble clear adhesive bandages that are stuck onto the teeth and left there usually for 30 minutes at a time, twice a day for a week or two.
Brush-On Whitening — These gels are painted directly onto the teeth with a small brush and sometimes left overnight.
Whitening Gum — If you are already a habitual gum-chewer, you might want to try this relatively new form of whitening. You may need to chew up to eight pieces a day to see results.
Whitening Toothpastes — remove surface stains and plaque with special chemical or polishing agents. Unlike bleaches, they do not change the actual color of teeth.