Honestly, quit being facetious. You darned well know the intestinal tract is nothing like a toothbrush bristle....unless you never had gross anatomy, in which case your education was sorely lacking.
Hell, we had something akin to gross anatomy in nursing school.....we had to attend several autopsies, had to put our hands in all the body parts and cavities...yes, even those......and the insides of the small and large intestines are mucus covered smooth muscle organs, and no meat, peanut butter, or anything else is going to stick to it. It was hard to even get the damned thing to sit still long enough to feel what it felt like....didn't scoot around the table like the brain did, but certainly wasn't dry, rough, or any other thing like that.
And that was in deceased humans. In live humans, it's even slicker internally. You know this, I know this, so stop the disingenuous comments unless you truly believe that......and then that sort of ignorance just reinforces the common belief that chiropractors are quacks.
Sorry, just calling them like I see 'em.
(ps.....the heart is slick smooth internally, also.....have had my hands in a few of those, too. Doing internal cardiac compressions gives one a unique perspective.)