When I was about 9 I thought that I would have to alternate my chewing so that I wouldn't get a cavity. So after I chewed a bite with my left teeth the next bite would have to be chewed up with the teeth on the right side. I'm 10 now and I know better.
A childhood belief about eating

others believed things like this
- I used to believe that if I chewed on one side of my mouth too much the other side would get jealous.Anon
- Until I was around 8 or 9 years old, I thought dentists took your teeth out and replaced them with new teeth.— Verapamilo
- I used to believe that eating burnt toast would make your teeth whiter and would brush your teeth for you.— Natasha
- 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
- Until I was about 8 I believed that your back teeth keep growing in until you have a full circle of teeth.Anon
- When I was very young, I assumed that false teeth were taken from dead people's teethAnon