I saw this horror movie it was a late 80s early 90s movies it was in color and in english. There was a scene with a old man and old lady who had a woman tied to a high back chair, they inserted a worm/centipede type monster into her mouth that stretched her mouth to it’s limits then they used some type of instrument to cut the end of the creature off which the scene turned to the inside of her mouth and you can see the the worm like monster writhing about as it goes down here throat. That’s all I can remember from the movie