The bones holding your teeth get a 'workout' when you chew, helping to keep them strong. The saliva produced while chewing is also beneficial, helping to clear food particles from your mouth and wash away bacteria so there may be less plaque buildup and tooth decay.
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Note that saliva also contains enzymes to break down food, and if you only drink Soylent I doubt you produce much saliva for digestion.
Quote: "Brawndo, it's got what plants crave!" Sorry, but 'teeth get a workout' sounds like something you'd tell a 4 year old.
I admit I don't know about the enzymatic action of saliva. I am not sure how important the loss would be if there's not large pieces of complex food to break down.
