Has anyone had experience of teeth whitening? I've been thinking about making this investement, but I've understood that there are different systems for doing it at the dentist.. Have you had good/bad experience from any particular system? I've also heard that it can cause teeth aching in long term, because it makes the enamel thinner? Just worried cause I've sufford this problem before.. Would be nice to hear your opinion/experience, and how much did it cost? Anyone done it in the UK?