He is doing special exercises to strengthen the incisivus labii superioris muscle.

When he eats an apple, he uses his incisors to bite it off.

My tooth hurts.

He works at the blacksmith's every day to forge his skills.

This festival is held every year.

He is working out his muscles at the gym every day.

She applied lipstick to her upper lip.

She applied lipstick to her upper lip.

She smiled using her levator labii superioris.

She started a special exercise to strengthen the incisivus labii inferioris muscle.