How do you say toothbrush in Japanese?
— 歯ブラシ (ha-burashi); 歯ブラシ

Generic synonyms for toothbrush in Japanese
brush刷子 (さっし, sasshi, はけ, hake); ブラシ (burashi)
moustache口ひげ (くちひげ, kuchí-higé); 口髭 (くちひげ, kuchí-higé)