I left mine in until they were barely hanging on, like a wimp.  Check this girl:

That did the trick!  I’ve heard of kids doing this type of thing before, so I’m not sure why this particular video warrants 1.7M views.

That would be THE WORST if the end of the string was reached, and instead of the tooth coming out it just hit the breaks on the arrow.

As usual, the YouTube comments never fail to disappoint *smh*.