How do I convince my girlfriend to get her teeth whitened by a dentist (without hurting her feelings)?

I had the same problem, my boyfriend is really good looking, but his teeth were kinda yellow, and it didn't gross me out, but I knew he could look better. So I started talking about whitening my teeth and using white strips, and then he did too. Problem solved, now that I know he cares about how his teeth look I'm not afraid to tell him he needs to whiten again. Honestly just use crest white strips they really work, and really fast too. Also when she does start using the whitening strips tell her how much its working, and how great she looks, just compliment her. Problem solved. And remember that your not telling her she's ugly, you helping her b her best.

offer to get both of your teeth done together.

and, if her teeth were naturally that color, then it would be impossible to change that without getting some major work done like caps or something like that.
her teeth may have been dye by drinking tea, coffee, or smoking.

omg that's a bit mean! why don't you get it done and offer to get hers done too , well you can't expect her to pay for something you want her to do

yeah definitely. just buy toothpaste with whitening on it. you would be amazed how bigger difference they make within a few weeks.

go to a store and look at some stuff and stop by the strip whitening products. tell her that both of you should try it.it really works dude.good luck