Met a girl today who looks like the cheerleader from Heroes - exactly the same smile.
Anyway, she said two of her teeth were 'sinking'. Turns out she had ankylosed lower deciduous teeth.
Having only heard of it in fabled lectures I was naturally rather excited. Cheerfully went to tap on the teeth to see if they really did make a more 'metallic' sound compared to non-ankylosed teeth.
Well, guess what? It did.
Made my day.