Brainteaser: Gold and Silver

(Image credit: Flickr user Mark Herpel)

I dig out tiny caves, and store gold and silver in them. I also build bridges of silver and make crowns of gold. Sooner or later, everyone needs my help, yet many people are afraid to let me help them. Who am I?

Continue reading for the answer.

Highlight here for the answer: A dentist.

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