When I was 7-ish my older sister told me that if I didn't brush my teeth before bed that the springs in my bed would come up and stab me! I still get slighlty paranoid if i hear the springs in my be move.
A childhood belief about under my bed

others believed things like this
- I used to believe that if I didn't brush my teeth at night, ants would crawl into my mouth and eat my teeth.Anon
- I used to believe when i was about 4 (now 15) that dinosours died because they didn't brush their teeth— gullable
- I used to think that cockroaches would visit your house if you didn't brush your teeth.Anon
- I used to believe that eating burnt toast would make your teeth whiter and would brush your teeth for you.— Natasha
- I thought "Angel of the Moring", by Juice Newton said "just brush me teeth before you leave me"!!!Anon
- My older brother used to tell me if you ate raw potatoes your teeth would grow long and curly!— Lauren