Harm will befall you if your use is too rough, will also befall you if not used enough. Pearly white, or yellow or brown, if you use me enough you will not need a crown.

I stop up the top, and keep it fresh. I go with glass, but I'm all natural.

You can wear me or hear me. Sometimes even eat me. I'm a collar for your finger or maybe a set of eyes for your front door.

I emerge from a tear that refused to fall, leading to a deadly point's formation. I may look as pretty as a crystal, but heavy is my potential to be fatal. So beware! Do not to fall for my illusion. Steer clear from beneath me to avoid misfortune.

Spin me round to simulate what all of us endure Though no one notices, 'cause relatively, we're secure A tool to picture something huge, though not perfect in scale I've evolved and changed throughout the years, since humanity set sail.