I used to think that the tooth fairy puts you in a deep sleep before stealing your tooth/teeth.
A childhood belief about fairies

others believed things like this
- I used to believe that in the tooth fairy took all your teeth and built a tooth city for her to live in!Anon
- My mother told me that the tooth fairy would only come if I brushed my teeth.— Dale
- As a child I was taught that the tooth fairy would buy our teeth so she could add them to her crown.— Lola
- when i was a child i used to believe if i put my tooth under the bed the tooth fairy would give me money— milena
- That the tooth fairy drove around in her green Volks Wagon Collecting teeth from all the children.— Wanda Trytten
- i used to believe that if my tooth came out the tooth fairy would come and kill me!!!— dangerous tooth fairy