As someone who has experienced decades of poverty and chronic depression who is now finally in a more stable place, I'd be willing to trade certain other body parts if it meant I could have a do over on my teeth. As long as the pain isn't life long, I'd get over it.
I'm self conscious about the way my mouth moves when I talk, how I smile or laugh (whether or not it's worth the risk) and even how I chew. I'd be willing to be a test subject, because God knows what they'd charge if it works.
Our bodies aren't 100% efficient when it comes to nutrient absorption anyway, so considering there's a number of other factors at play, it's probably making minimal difference.
When we eat, the food added to our stomachs signals the large intestine (colon) to get a move on and make room for incoming food. Caffeine can help stimulate this response, but since most nutrient absorption occurs in the small intestine, we're not really losing anything of value. There is some absorption in the colon, but that's mostly water being removed so we can have formed stools instead of chronic diarrhea.