Instead of rewarding your child with a treat from the tooth fairy, you can always use the fear tactic and scare your child into brushing their teeth everyday. Buba will surely be the source of many nightmares.
Implications - Buba is an interesting (and dark) twist on the common tooth fairy theme. Buba serves a fetish object, using a child's own milk teeth. It serves as a personal guardian against imaginary threats. You know what they say: irrational solutions for irrational fears. I dig it.