Milo has a seemingly insatiable appetite for absolutely anything inedible; he's quite fond of floor lint.
No matter what I do, no matter how much I vacuum, I am constantly pulling thick, long threads from his mouth and endless dust bunnies from his nose.
And he's not for lack of proper teething toys and good, solid foods for him to gnaw on. He's simply demonstrating a culinary preference.
He's gained 50% in weight in the last month, and I'm proud to say he now meets the weight gain requirement to work in Tech Support for my employer.