Fluorine F

Atomic Number: 9
Atomic Weight: 18.9

Human Physiology:

• Strengthens tooth enamel

Prevalence:

• Found in earth's crust as fluoride compounds (Fluorine is a greenish gas) in concentrations of 540000 ppb(parts per billion)

Source:

• Drinking water
• Toothpaste

Deficiency:

• Soft teeth, dental caries

Excess:

• Nausea & vomiting
• Diarrhea
• Drooling, numbness, tingling or loss of feeling in extremities
• Convulsions
• Muscles stiffness
• Drowsiness