Yes...

But seriously, there are simpler tests to do, or to do first. Try telling your parents not out loud, but in a written note. That would rule out audio bugging. Try telling an empty room, when no one else is around. That could rule out your parents. Try telling someone you know won't understand you. (Like a younger sibling.) Try miming it to your parents without using words. Try falsely telling your parents that a tooth fell out, when none did. Try telling your parents about your tooth that fell out, but not putting it under your pillow that night. Try giving your fallen-out tooth to a younger sibling and tricking him into pretending that that tooth was his to your parents. (Although that would probably mean giving up the income from that tooth.)

All in all, there are a lot of possible open tests that could be done, to narrow down the search space dramatically.