My analogy for this sort of thing is always sand in the lettuce. It's amazing how easily you can ruin lettuce if it just occasionally crunches against your teet

My analogy for this sort of thing is always sand in the lettuce. It's amazing how easily you can ruin lettuce if it just occasionally crunches against your teeth in that particular way: you start dreading the sensation. You can't see it coming, it's not constant, but it's horrible.