Gum damage from tooth whitening
The material used in take home tooth whitening can actually be beneficial to the gums. If the tray that the material is placed in is not made properly, then it can irritate the gums, but this is generally a temporary situation.
In-office whitening uses a stronger version of the same material. The gums should get a protective barrier before the whitening material is applied because it will cause a chemical burn if it sits on the gum tissue during the entire procedure. If this occurs, the...