You need to show her that you have other options. You are not some left behind wallflower (which is how she sees you). That's why she's mad about the teeth. She's afraid you'll be attractive to another woman, and then she won't have 2 men. And to add insult to injury, you spent money on your worthless self! (That's how she sees it, I don't think that.)
You can date and keep it non-sexual. I'm sure there are a LOT of women who would be thrilled to just spend a pleasant evening with a man and not feel pressured to have sex. Is there something immoral about dinner and a movie? Or lunch? Bowling? Dancing? (OK, depending on how you dance, but I'm assuming you could be calm.)
Here's food for thought. Is it more immoral to allow yourself to be in a de facto multiple spouse relationship or to go out on some friendly dates? I daresay this is why you exploded yesterday, because she has forced you into an immoral relationship and you are stuck in it.
Now I have to go plant flowers with my neighborhood.
You know that is a tough one, that I have thought about myself.
Are you doing it so that you can move on and find someone who cares about you or to make your wife jealous?
You have to be careful because if you are not totally over wife and I think you are like the rest of us, not really, then you may end up hurting someone if you date them. We know how bad it hurts so we have to be careful.
Life's challenges are not supposed to paralyze you, they're supposed to help you discover who you are. -- Bernice Johnson Reagon