Toothbrush

wiktionary

ref

From tooth +‎ brush. Compare Saterland Frisian Tuskebäärsel(“toothbrush”), West Frisian toskboarstel(“toothbrush”), Dutch tandenborstel(“toothbrush”), German Zahnbürste(“toothbrush”), Danish tandbørste(“toothbrush”), Swedish tandborste(“toothbrush”), Icelandic tannbursti(“toothbrush”).

etymonline

ref

toothbrush (n.)

also tooth-brush, 1650s, from tooth + brush (n.1).