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I agree it sounds like bullshit.

However, I have listened to a talk by a lady (she consults on murdered cadavers) who can tell which season a body died in by analyzing the teeth! Apparently there is a lot there.

That I can believe, assuming a detailed analysis in a lab. But snap judging from a distance? Cavities are more common in modern populations than before, but hardly omnipresent. I do find it an amusing thought that apparently my skeleton would be assigned a more distant past simply because I am filling free. :D

It might be not that hard for someone who's literal job is examining skeletal remains.

The more likely sign is not fillings, but acid damage, which softens teeth and cause biting and grinding to wear down the surface of the teeth. You can have no fillings and still have very noticeable acid-related damage.

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