From Longman Dictionary of Contemporary Englishthe roof of somebody’s mouththe roof of somebody’s mouthHBHthe hard upper part of the inside of your mouth → roof
Examples from the Corpus
the roof of somebody’s mouth• The brittle wafer dissolving against the roofs of their mouths was their promise of life in a world beyond Holy Hill.• Clench the jaws, as if chewing hard, while pushing your tongue hard against the roof of your mouth.• It burns the roof of my mouth.• An' the third one's brain had bin pulverised - by a blow delivered through the roof of its mouth!• I can eat no more of the wild rice which tastes nutty and clings to the roof of my mouth.• My tongue froze to the roof of my mouth; my eyeballs dropped from their sockets and clattered at my feet.• Her tongue was glued to the roof of her mouth.• I rubbed it across my tongue, the roof of my mouth, and I ground it between my teeth. 