Where does “tannbørste” come from?
tannbørste (Norwegian Bokmål) comes from Norwegian Bokmål børste, from German Bürste, from Middle High German bürste, from Old High German burst, from Proto-Germanic burstiz, from Proto-Germanic bʰurstís, from Proto-Indo-European bʰr̥s-tí-s, from Proto-Indo-European bʰers- — top, tip, point.
tannbørste (Norwegian Bokmål): a toothbrush
Ancestry of “tannbørste”, step by step