I used to beleive that (like your teeth do) your lips would fall off so new ones could grow.
A childhood belief about general

others believed things like this
- After your teeth fall out when you're a kid, your gums fall out. Then you get new gums and teeth.— Erin
- My mom used to tell me that if I sucked my thumb, my teeth would get so bent up, they would all fall out— I dont suck my thumb anymore
- When I was little I believed that when I put lipstick on my lips, the lips grew.— Alba Águila Castelló
- I used to believe in Perez mause when my teeth fall, I put them under the pillow to see what happened— AyrtonZ01
- I used to belive kissing boys made your teeth fall out.Anon
- When I was little my big brother told me that if I ate raw potatoes my teeth would grow curly. — Lauren