Apparatus, systems and methods for dental treatments

A method for executing dental treatments, comprising:

• i. positioning a mouthpiece including one or more dental cover layers over upper teeth and surrounding gums and/or lower teeth and surrounding gums;
• ii. applying a fluid sealed vacuum to the dental cover layer so that a fluid sealed treatment cavity having a pressure below ambient pressure is formed around the teeth and surrounding gums;
• and
• iii. flowing one or more treatment materials into the fluid sealed treatment cavity, wherein the dental cover layer includes one or more hardened sections for enabling selected/differential collapsibility of the mouthpiece when exposed to the vacuum pressure and;
• iv. flowing out one or more treatment materials from the one or more fluid sealed treatment cavities to a waste container

A device comprising

• a. a deformable selective elastomeric gum sealing portion for covering a gum ridge;
• b. a distal tooth sealing portion, wherein the gum sealing portion and the distal tooth sealing portion define a gap between at least a portion of the device and the tooth and surrounding gum over which it lies;
• and
• c. at least one fluid conduit portion for passing a fluid into or out of the treatment cavity;
• wherein on the placement in a patient's mouth over a plurality of teeth, the gum sealing portion contacts and deforms against a gum ridge of the patient for forming intimate contact with the gum ridge, and the distal tooth sealing portion deforms against distally located tooth or teeth for substantially defining a seal at the distal tooth, so that a fluid can be introduced, removed, or both from the treatment cavity while maintaining a seal with the deformable gum sealing and tooth sealing components, and
• wherein the deformable gum sealing portion includes one or more hardened sections for enabling selected/differential collapsibility when exposed to vacuum pressure.