When to use toothbrush in Korean
Korean: 칫솔[ chis-sol ]

When to use it
A toothbrush (칫솔) is a small tool you use to clean your teeth. People usually use it with toothpaste in the morning and before bed. You can keep it in the bathroom, pack it for travel, or buy a new one at a store.
Example sentences
저는 아침에 칫솔로 이를 닦아요.
I brush my teeth with a toothbrush in the morning.
칫솔이 욕실 컵 안에 있어요.
The toothbrush is in the bathroom cup.
학교 가기 전에 칫솔을 챙겼어요.
I packed my toothbrush before going to school.
여행 가방에 칫솔 하나 넣어 주세요.
Please put one toothbrush in the travel bag.
마트에서 새 칫솔을 샀어요.
I bought a new toothbrush at the mart.
동생아, 네 칫솔은 파란색이야.
Little brother, your toothbrush is blue.