There's also mercury in vaccines. But thanks to the miracle of chemistry, you're safe. Just like the chlorine in salt doesn't kill you.
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You're using a bad argument. Dental amalgam literally contains elemental mercury: https://en.wikipedia.org/wiki/Amalgam_(dentistry)#Compositio... That alone is cause for concern, although it does not mean it's necessarily dangerous: https://en.wikipedia.org/wiki/Dental_amalgam_controversy
Mercury (or rather, Thiomersal) hasn't been used in the vast majority of vaccines since the 90s. It was completely safe as far as we know, but was removed as a precautionary measure during a push to remove all sources of mercury from food and drugs.