DH was given a 'kit' by our dentist to take home and do himself. That was about 6 years ago. I remember it costing just over 150.00 and being upset as his already white teeth got to be whiter, while my off white/slight yellow stayed the same as we could not afford for both of us to have this done (let alone him have it done-no insurance covers the stuff). Dentist sold it to him without my knowledge and DH does what the drs tell him to. The argument lasted about 4 days. He has not done this since. Whitening did not last. With meds he is now on, his teeth are now slightly discolored. We changed dentists.