This is not a simple "line"

Modern people chew various foods every day and only clean their mouths (brushing teeth) at specific times, which can no longer meet the needs of oral hygiene. Dental floss is instant, affordable and effective, so it should be promoted. However, modern people still have certain misunderstandings about dental floss and do not know how to use it correctly. This work popularizes dental floss from the perspective of the subjects, with simple layout and clear pictures and steps, which is easy for readers to understand and has certain application value.