MCaldwell Dentist malocclusion – improper alignment of upper and lower jaw or teethmandible – lower jawmandibular canal – space within the mandible which holds the blood vessels and nerves for the lower jaw and teethmastication – chewing, generally of foodmaxilla – upper jawmaxillary sinus – open cavity inside the maxillamolar – rearmost teeth, cusped, used for grinding foodmouthguard – appliance used to protect the mouth and teeth during rigorous activity, such as sports