Years ago (well, only 3 years, but that's a lifetime to a 5 year old!) Isaac watched an episode on TV with the Toothfairy and was captivated by the concept of a being who would trade him a tooth for money. For a time he'd wiggle his teeth in the hopes of moving the process along and so I was naturally shocked when the dentist informed me that he really did have one loose.
The tooth fairy was generous and gave him $2 and a note saying something to the effect of looking forward to more visits in the future.
A week later his second one fell out, now he REALLY has a gappy smile! (Ahh, the awkwardness of growing up, so endearing when it's your own children and not you!) This time the tooth fairy gave some hygiene advice - Floss your teeth often. Yay tooth fairy, maybe Isaac will listen more to her since she holds the purse!