That’s where your tongue goes when you relax it. We imagine tongues as being flat, but that’s only when we make an effort to make them so. When relaxed, they fill up the mouth cavity, which is good because it keeps air out. This means a little saliva can keep all of your mouth moist and healthy.
The tongue is all muscle, which is the closest we humans have to a tentacle.
If you think about it, the tongue has less room in the lower jaw because it’s attached there. The fact that it can stick out past your lips means it’s in a sense too big for your mouth. Resting at the back of the top teeth is more relaxed and less cramped because it does so along a hypotenuse, so to speak
Our tongues are too big for our mouths, so when we relax them they push against our teeth and because our teeth aren’t going to give way, our tongues bunch up a bit.
Btw. whether your tongue bunches more to the top or bottom of your mouth heavily depends on your mother tongue. For native German and Russian speakers it presses against the bottom of the mouth.
I’m guessing speaking different languages and thus making different sounds more often affects how the muscles of our tongue are developed.
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