Yep, I know it. 😃 So... I had thought to cut out a picture that could seem like an "internal cavity" of the mouth or throat or something like that and to repeat it... but how? And is the right thought?
(I always write that -this time I have forgot-:the point is that I am a self-taught student)
You would need a hole for the mouth (mask it) and a layer of the inside of the mouth with a hole in the center, make them 3D layers and stack multiple copies of the inside of the mouth, pushing each back in z space rotating and offsetting each to create the "tunnel".
Then animate your camera to fly through it.