He smiled, showing his lower teeth.

He is conducting research on the radula of mollusks.

He died young.

He is dedicated to the study of the dentary bone.

If you don't brush your teeth every day, dental plaque can accumulate and potentially cause cavities.

While waiting for the test results, he gritted his teeth.

In the Edo period, women blackened their teeth as a symbol of beauty.

He likes to take a walk in the park at dusk.

Well then, I'm off.

He admitted that it is difficult to execute the plan, saying 'it is easier said than done.'