dental floss
Standard term for dental floss; literally 'thread toothpick'.
I use dental floss every night before bed.
Common mixed kanji-kana spelling; the kana portion avoids the uncommon kanji 楊枝.
Full kanji spelling; 楊枝 is less common than ようじ in modern writing.
Compound of 糸 (thread) and 楊枝 (toothpick), literally 'thread toothpick'. The spelling 糸ようじ is common because 楊枝 is often written in kana.