Going to get 4 new crowns - dentist suggested Zoom first. Went to office today for procedure and was given consent form. I questioned if I would see any difference since the info stated that Zoom does lighten "gray" teeth as much as yellowed/brown teeth. Ended up not having Zoom . What is your experience on patients with gray teeth (I am 62 - not exactly looking for a bright WHITE smile -just wanted a nice smile with new crowns that match my teeth). Paula