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Looks like solder to me. I can't imagine holding some solder (usually only ~40% lead) in your teeth would give you that much exposure to be an issue. But I suppose doing it all day, every day, for years could add up.

The lead vapors from having your unshielded mouth that close would be much worse than any direct contact with your tooth enamel, from what I know.

Lead vaporizes at 1749 °C. Not going to happen while soldering.

I don't believe that's quite how it works. I don't think it needs to vaporize the way boiling water vaporizes, to be entrained in the smoke.

Of course, liquids have vapor pressure at any temperature between melting and boiling. I think there is no question that whatever vapor there is can be carried by convection along with the hot gases.

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