So I'd really like to get my teeth whitened. I love tea but it shows too much. I brush my teeth every day but it doesn't make a difference. What the hell brands work? Are there any actual things I could pick up in Boots that work or would I be better off getting them professionally done? I'm willing to spend money but don't want to harm my teeth either in the long run so don't know whether I'd be better of going DIY or getting a professional treatment! Please help!