How did horrid Henry lost is first tooth?

Horrid Henry's first tooth wasn't lost in a thrilling, dramatic way. It actually fell out quite innocently, while he was eating a banana.

This is mentioned in the book "Horrid Henry's Tooth", where he's desperately trying to make his tooth fall out (by swinging from a rope, banging his head on the wall, etc.) but it stubbornly stays put. In the end, it falls out while he's enjoying a banana, much to his disappointment.