Again?

Frank finally lost his second tooth.  And he lost it.  Again.  He was brushing his teeth this morning, and all the sudden he yells down the stairs, "Mom you've got to see this."  I went upstairs, and he said, "Look, I lost my tooth, only, I'm not sure where exactly it went..."  And he procedes to look around the bathroom, and studies the sink drain rather closely. 

Just a recap:
Number of teeth Frank has lost (i.e. they fell out):  2
Number of teeth Frank has lost (i.e. never to be seen by me):  2