Signs pointing to tooth:
It feels hard, and didn't bleed when I poked it (so it isn't thrush).
Signs pointing to not-tooth:
Gwen has none of the signs of teething (red cheeks, drooling, chewing things, fever). With the exception of irritability and fussiness, which could be caused by any number of things. Plus, she's TEN WEEKS OLD. And wouldn't the fussiness be going away, now that the 'tooth' is through?
(PS: Yes, I know my title is groaningly dumb. But it made me smile, so whatever.)