My tooth hurts.

Fluorine is one of the chemical elements, and its symbol is F.

Health is very important.

His opinion is very important.

Health is more important than anything else.

He is very healthy because he exercises every day.

Hydrogen is the most abundant element in the universe.

My tooth hurts.

My tooth hurts.

By looking at the age of the teeth, you can tell the lifespan of an elephant.