In any case, a toothbrush is a מִבְרֶשֶׁת שִׁנַּיִם (listen and repeat).
Likewise, an electric toothbrush is a מִבְרֶשֶׁת שִׁנַּיִם חַשְׁמָלִית listen.
The root of the word מברשת is ב.ר.שׁ (b.r.sh), which looks like a proper Hebrew/Semitic root. But looking into it a bit, my suspicion was confirmed that the root ב.ר.שׁ actually comes from the English brush (also Wiktionary).
About the Author: Ami Steinberger is founder and director of Ulpan La-Inyan.
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