shackled

You can always use examine.com to start base level research on most substances. It tries to cover the most common questions and link the research papers most relevant to that question if available. Excerpt below, but I recommend scrolling through the whole page. It also discusses maximum safe daily levels, toxic levels, and symptoms when you exceed those levels.

Fluoride (from drinking water, supplements, tea, or dental products) is absorbed by the small intestine, and about half is excreted via the kidneys. Absorbed fluoride in the blood can bind with apatite in bone and teeth, becoming fluorapatite. Blood and bone concentrations of fluoride are in equilibrium and are impacted by bone remodeling activity and age.

Staking should without a doubt be slowly vested not immediate at the start of hiring. The vesting period can be adjusted to the current owners risk level. As someone else mentioned below, the employee can be offered profit sharing until they are fully vested and own voting stake in the company.