Has anyone used obe of those home tooth whitening kits?

[RonettePulaski]

The kind advertised on groupon and the like for £20 ish

Are they any good or will it melt my teeth?

I haven't tried one but I had my teeth whitened professionally a few years back and was quite disappointed by the results - cost me £500 plus.

Now I use Colgate Max One toothpaste at £4 a pop and it works as well tbh. I haven't had any sensitivity using it - which can be common with tooth whitening.