This might be a bit pugnacious, but it's how I feel:
http://rickwilsondmd.typepad.com/ri...ce-cosmetically-versus-cosmetic-dentists.html
Summary: Everything we do can and should be beautiful and cosmetic, all the time, for every patient, only restricted by the technology at our disposal and, at times, the patient's finances.
And just to make up for that squirelly old bridge- that I didn't create!- here's a look at what's possible now, along with some neat dental history:
http://rickwilsondmd.typepad.com/ri...ins-with-and-without-metal-substructures.html
Summary: When everything is essentially healthy, bring as many teeth up to modern esthetics as your patient allows you to. But when they say an older restoration is "good enough", like #6 in my post above, well, then, if it's not carious or fractured, your patient is telling you that it's good enough.
Two last things. First, I'm not at all convinced that the level of gingival inflammation around that #6 is completely innocuous, not even systemically. Evolutionary biologist Paul Ewald PhD started a long line of investigation into the systemic effects of chronic inflammation of all kinds, and various investigators are discovering interesting things about it. But until the literature supports the idea of this kind of small-scale oral inflammation being dangerous, we really can't make any claims or take any dramatic actions. Correcting it with necessary dentistry is about as far as we can ethically go.
Second- I don't hesitate to share my blog here because I prefer transparency to anonymity. It's usually more polite that way.