My dentist obviously believes in patient involvement. Last time I went to see her, she insisted on showing me digital images of a crack in one tooth (how comforting to see it Grand-Canyon-size on the TV screen). Now she's rigged up a mirror over her inspection light, so that the patient can see exactly what she's up to in there.
No doubt there's plenty of clinical evidence that this reduces anxiety, and the good Liberal Democrat in me is all for empowerment: but I'm not that keen on seeing exactly what each pointy, shiny, whirry implement is doing as it prods, chips, scrapes or polishes away.
My teeth aren't something I can view with any degree of detachment: not while they're still attached to me.