I've never really understood this myth. Where does it even come from? I guess It comes from how bleaching is common practice in the US where as here it's rare because it's purely cosmetic, so where as in the US if they can charge you for it they will do it, here it's a case of if you should have it.
In fact, Teeth naturally get darker over time, White teeth are unnatural unless your under the age of 10 as only milk-teeth are white.
The NHS is one of the best things ever.
In America if you have a terminal illness and you may have to pay over $100,000 a year for meds! In the UK everyone pays ~1/62,641,000 of the cost.