As John Tan puts it pithily, "Thousands Of Michigan
Kids Poisoned Because They Don't Have PUB And PAP!"

Hundreds of thousands of Americans poisoned with permanent brain
damage due to high levels of lead in city's drinking water gone
undetected for decades.
https://www.yahoo.com/news/lead-flints-water-linked-decline-birth-rate-study-finds-224123699.html
Did you know... the Mad Hatter character from "Alice In
Wonderland" is based on the tragic real-life cases of millions of
people gone mad (ie. permanent brain damage) from wearing and/or
producing hats, poisoned by mercury used in the manufacturing
process of the hats, gone undiagnosed for several centuries!
https://en.wikipedia.org/wiki/Mad_hatter_disease
A BedokFunland JC H2 Chemistry Question :
1. Explain why or how heavy metals cause toxicity in the
human body (there are several modalities, use any modality you're
familiar with, and/or from the H2 Chemistry and/or H2 Biology
syllabus). Include relevant equations and/or diagrams in your
answer.
2. State the medical treatment for heavy metal poisoning, eg.
lead poisoning, explain why or how this medical treatment works.
Include relevant equations and/or diagrams in your answer.