As will be revealed in the next frame, Danny's head rests on a stuffed bear pillow. See the mirror both bear and doctor create.

DOCTOR Now Danny, when you were brushing your teeth, do you remember if you smelled anything funny, or saw any bright flashing lights, or anything at all strange?
DANNY No.
DOCTOR Do you remember when you were brushing your teeth?
DANNY Yes.
DOCTOR What's the next thing you remember after you were brushing your teeth?