this post was submitted on 25 Jul 2024
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https://www.atsdr.cdc.gov/csem/leadtoxicity/physiological_effects.html
I'd call that "you really shouldn't" for an adult, and for a baby I'd tell them to "please reconsider" for sure
I have a toddler and I hope to dear god there's no lead about. She will lick anything.
It isn't safe at any dose but the amount of harm from licking it once is definitely rather small. Probably safer than having a couple of alcoholic drinks or a single cigarette.
The inside of your mouth is on the outside of your body and so is the rest of your digestive tract, safely (well) isolated (unless it's permeable) from your bloodstream. As a first approximation, our bodies are toruses. Just licking something is really not much more intimate than touching something unless it's sugar which can be taken up right there on the spot. (At least glucose can and there's enzymes in salvia don't ask me for details).
All that said the Romans used lead(II) acetate as a sweetener and while definitely a bad idea, they didn't all immediately keel over either. You'll almost certainly be fine.
Pure water OTOH... you'll burn your mouth because osmotic pressure tearing cell walls apart before the stuff dilutes to have a sensible amount of minerals in it. The tissue there is used to sudden violent cell death and heals quickly so no biggie, if you survived a too hot pizza you'll survive water. Also, do eat that pizza to have enough minerals to replenish everything.