Removable oral devices for use in weight management and other applications

A removable oral device configured to reduce oral volume during eating of food to reduce consumption of amounts of the food, the removable oral device comprising:

• a palatal element configured to contact a roof of a user's mouth at a palatal surface, the palatal element comprising a body comprising a thickness configured to lower a vaulted area of the roof of the mouth to decrease an overall oral volume of the mouth to a first oral volume, the body comprising a variable hardness across a tongue surface of the body;
• a clasping element coupled to the palatal element, wherein the clasping element is configured to assist in removal of the removable oral device when the removable oral device is inserted into the user's mouth, wherein the variable hardness across the tongue surface of the body comprises a Vickers Hardness that gradually decreases from a central apex to outer edges of the palatal element such that the Vickers Hardness at the outer edges adjacent to the clasping element is at least 20% less than the Vickers Hardness at the central apex;
• and
• a processor within the palatal element, wherein the removable oral device is configured to be inserted and retained in the mouth during the eating of the food, and wherein the removable oral device is configured not to alter or retain a position of the teeth with continued use of the removable oral device.