I had teeth whitening about 10 years ago, or whenever it became more of a thing for the first time and was pretty underwhelmed by the results. I think I had it again about 7 years ago wondering if I'd maybe just got a dud formula or dentist but again I got pretty underwhelming results. I read something recently suggesting that some people do it much more regularly and they feel they get a cumulative effect. These were Americans on social media though. Just wondering if there's anything to this suggestion - if I did much more of it would m y teeth eventually be whiter? They've always been pretty yellow despite the fact I don't eat curries more than very occasionally and don't drink tea, coffee or red wine.