2 of 3 added 208 characters in body

I think you are a:


I live in a palace where it's dark inside
No light in there, unless open wide

Teeth live in mouths, which fit this description

Even though I am not a king, sometimes I wear a crown

Teeth sometimes have crowns

I am not a queen either, neither I am a clown

Obviously teeth are neither queens nor clowns, but I'm not sure if I'm missing a more specific connection here.

I'm known for tearing stuff by moving up and down

This describes chewing food

Don't take care of me and I might hurt you

If you don't brush and floss your teeth, they'll start to hurt!

Take care of me and get better pictures of you

People like to have a dazzling white smile for photos!


Without teeth, it would be harder to eat, which would definitely make life hard!