As in what's facing up (or down) rather than outward. I've noticed that my molars especially are yellow-ish on their top portion -- I'm guessing from lots of coffee drinking. Is there anything I can do to remedy this? I'm the only person that sees it but it just looks kind of disgusting. I've been brushing my teeth with whitening toothpaste for a long time to no avail.
Would putting opalescence whitening gel on the top portion of the tray I got from the dentist work?
Would putting opalescence whitening gel on the top portion of the tray I got from the dentist work?