Migrating masticators, or: tooth drift!
It's weird- I've been having floss more due to a gap growing as I age; and decidedly my teeth have all shifted from my youth, when they were forcibly straightened into perfect, unnatural lines by orthodontic instruments of torture.

Why is that? It's not like I chew whale blubber regularly, or gnaw the furniture in preparation of building a dam. I don't even like to chew gum (thanks to the aforementioned orthodontic trauma) ...and my favorite oral hobby frowns on the use of teeth.
So, why are they moving? Was I a bad landlady? Did I not meet all the Health and Fire Standard Requirements for Residency in a single-wide mouth?