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 is working out his muscles at the gym every day.

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

This festival is held every year.

She applied lipstick to her upper lip.

She applied lipstick to her upper lip.

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

She smiled using her levator labii superioris.