Pur erh tea has stained my teeth

I've been drinking pur erh tea three times a day, like you're supposed to, for the past month or so. I can't swear to any magic weight loss properties ( I have lost a few pounds but then again I've been on a diet), but I can swear to one thing. It's stained my teeth. They look horrible.

So to anyone I promised Whitestrips to, I'm sorry but you can't have them. I urgently need them for myself.