Brushing 4 times a day won't reduce the amount of staining. Home kits are perfectly safe, what I have a serious problem with are professional kits bought from ebay and other such places. When people do that, they get no instructions, have no idea what is in the gel (it could be knock off stuff from anywhere in the world). My best results are achieved with a combination of disposable and custom made trays. Works an absolute treat for me!
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