The system of the preferred embodiments includes a mask shell, where an opening of at least one square inch is located in the mask over the users mouth, where the mask shell is designed to fit over the users mouth and nose a strap connected to either lateral side of the mask shell and adapted to go at least one of behind the users head and around the users ears to pull the mask onto the users face an oxygen supply tube connected to the side of the mask shell over the users cheek, and in fluid communication with the inside of the interior cavity of the mask shell a second tube connected within a half inch of the oxygen supply tube, wherein the distal end of the second tube connects to a carbon dioxide sensor, wherein the second tube is adapted to convey exhaled gas to the carbon dioxide sensor. The transoral procedure mask of the first preferred embodiments is preferably designed to allow simultaneous delivery of high flow rates of oxygen to a patients nose and mouth while also allowing access into the patients mouth of one or more of instruments and tools, while not having nasal prongs which can lead to nasal burning in patients at high flowrates, and while having an integrated tube for connection to a carbon dioxide partial pressure sensor to provide constant and convenient oxygenation monitoring. The system of the first preferred embodiments may, however, be used for any suitable reason.
