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He should be doing this but cleaning the plate with toothpaste and warm water helps. Also soaking it in warm water with a sterident denture tablet helps get rid of bacteria too.
Does he brush his teeth before going to bed?
Also look into biotene dry mouth toothpaste which helps people who suffer from dry mouth and bad breath which he would be having from the plate
My husband breathes all over me in his sleep too, I either face away from him or fold half my pillow up so half rests against his pillow. My pillow is in a sideways L shape, it blocks his breath.
Have him rinse with antimicrobial mouth wash before bed and try a breathing strip on the nose