A device, method, and system are provided for aiding the whitening of teeth. The device includes a mouthpiece suitable for implementing a dental treatment, wherein the mouthpiece includes one or more stock dental cover layers suitable for forming a treatment cavity having a vacuum, wherein the dental cover layers includes a layer over the upper teeth and/or a layer over the lower teeth； and one or more treatment supply layers wherein the treatment supply layer has one or more flow channel in fluid communication with the treatment cavity so that the treatment supply layer can deliver and/or remove one or more treatment fluids from the treatment cavity.
