The tooth fairy here pays $2, but we have a $2 coin up here, so it works well. They get $5 for the first tooth.
Benjamin was 5 and had no front teeth at all for awhile (top or bottom LOL). Amelia is almost 6, and only has 1 loose, none missing. The one that's loose is only that way because of a Wii accident last Christmas. They told us it was fine, and just to leave it.
If it makes a difference, Benjamin was 5 months old when he got his first tooth, but Amelia was 11 months before she got a tooth. I have heard this makes a difference as to when they lose them, but i don't know.
I hope you get to see someone and they'll let you know what's best! I'd say at this age, if the teeth are ok, they'd probably leave them. I see that Libby posted to you, and she was a great help to me, and good at reassuring me, after Amelia got hit in the mouth too LOL.