Awaiting the tooth fairy

Today my littlest lost his first tooth. I'm so excited! He's happy that there wasn't much pain involved and intensely excited about what the tooth fairy will bring (what's the going rate?).

Conversation went like this:

"Today's an important day for me too!" said Callum.
"Why's that?"
"My tooth has fallen out."
"How does it make you feel?"
"Good. When I was brushing my teeth, it fell out and I touched it."
"You look so different. Looks like a TUNNEL!" me
"A train can't fit." Callum.
"What about a car?"
"No. An airplane can fit!" excitedly.