My mother, who is damn certain to be neater and cleaner than the OP and RICH put together, brushed and flossed, went to the dentist all her life regularly. Ended up with dentures. Weak enamel. What can you do? Knowing this I've worked like a dog to keep mine nice. Sucks, two perfectly cared for teeth, replaced for me now with ceramic ones drilled into my jaw. Don't give us your bullshit about lack of care or laziness. Pure bullshit in my and my family's case.