They apply the bleach themselves in trays that look like gumshields and which are worn at night. 'Many over-the-counter bleaches have a very high acidity, which can damage the teeth,' says Dr Phil ...

Using a 3-mm extended tray during at-home nightguard vital bleaching (NGVB) may increase the risk of gum irritation, according to a clinical trial published on November 18 in the Journal of Prosthetic ...