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That’s how dentists check for issues as well: they very briefly shine a light through your teeth and capture a picture the resulting shadow.

"Light"?

Most light won't make electrons frolic in your body.

Startup opportunity for a light based 3rd tooth scanner?

Check if glidewell has a patent on it first. They have the smallest intra-oral scanner I've seen, and I saw it 12 years ago. It's like a cigar. I may be wrong and they didn't make the scanner.

Also a nice way to realize how cracked your teeth might be.