Every week a Guardian Money reader submits a question, and it's up to you to help him or her out – a selection of the best answers will appear in next Saturday's paper.
This week's question:
I'm considering having my teeth whitened and need some advice. I've seen some teeth whitening kits for just £9. Full dental treatnent can cost £300 or more. What do you have to pay to do it properly? Does it work, and will it hurt?
What are your thoughts?