I thought the sort of tooth-whitening kits you could get in Boots were to get rid of surface stains, rather than deeper problems? I can't believe they'd be suggesting something that costs 400-600 quid if I could really get the same effect for under 30 quid -- I mean, they said there was no point in me getting my overlapping front teeth straightened because it'd be expensive, & that would've been something they could have easily pushed for on health-ish grounds (making them easier to clean) if they wanted to make money out of me. I dunno, maybe I trust too much in the principle of you-get-what-you-pay-for, but.