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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


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!