system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How are humans able to hear tiny sounds they make inside their body?

For example when I'm gently tapping my teeth against eachother in my mouth (while closed) or playing around with my saliva I'm able to hear the sounds they make, whether they're sounds from my mouth or throat how come I'm able to hear them, shouldn't the soundwaves be isolated?
gpt
It's actually quite the opposite. Your body is making a hell of a lot of noise (rest your head on someone's stomach some time), which your brain filters out. A disorder of the inner ear called superior canal dehiscence syndrome causes people to hear these sounds - including the sound of their eyeballs moving. 

Noises that aren't made internally (like tapping your teeth) pass through the solid matter in your head and manually stimulate the ossicles - which your brain can't filter out.