Systems, devices, and methods for reducing a temperature of a user's mouth and surrounding tissue

A mouth-cooling device comprising:

• a body configured to fit within a user's mouth, the body comprising:
• an outer reservoir including an outer reservoir cavity, the outer reservoir being shaped to extend between a superior oral vestibule cavity of the user and an inferior vestibule cavity of the user when worn with a front side of the outer reservoir being configured to be placed proximate to the superior oral vestibule cavity and the inferior oral vestibule cavity and a back side being configured to be proximate to a buccal side of the user's upper jaw and lower jaw when worn by the user;
• an inner reservoir including an inner reservoir cavity, the inner reservoir being shaped to extend between a lingual side of the user's upper jaw and a lingual side of the user's lower jaw and abut the user's tongue when worn;
• a connecting portion configured to connect the inner reservoir and the outer reservoir and fit between the user's upper jaw and lower jaw when worn;
• an exterior component that includes an external cavity, the exterior component being sized and configured to reside outside the user's mouth when the mouth-cooling device is worn and extend from approximately a left commissure of the user's lips to approximately a right commissure of the user's lips, wherein a volume of the heat-absorbing material is resident within the external cavity;
• and
• a heat-absorbing material resident within the outer reservoir cavity, inner reservoir cavity, and the exterior component cavity, the heat-absorbing material being configured to absorb heat from inside and outside the user's mouth when the mouth-cooling device is positioned therein.