Safe - and cheap - teeth whitening?

[CherryRipe]

All of those years of coffee and red wine have finally taken their toll and my teeth are yellowing. My dentist said that it was just ageing
Is there such a thing as safe (and effective) teeth whitening at a reasonable price?
Has anyone had it done? Any horror stories?
Any advice or experiences much appreciated.

have you tried just visiting the hygienist a few times? mine always look so much whiter afterwards

Yep. I visit the hygenist 6 monthly and my teeth are still a cream colour. She tells me that my teeth are fine and that I just need to accept that they change colour with age. I could get the whitening done at the dentist's but it's VERY expensive, hence why I'm wondering about cheap 'at home' products.

if it's safe its not cheap, if it's cheap it's not safe.

I've used a brand called maxbrite over the net - about 20 or 30 quid and brilliant results. Read about it at the time and seemed safe enough if only done occasionally (i.e. a few nights at a time once a year or two) - can't see how that would make 'em drop out anyway.