how to say “toothbrush” in Hebrew
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מִבְרֶשֶׁת שִׁנַּיִם
A tooth is a שֵׁן ( ), while teeth are שִׁנַּיִם ( ) (a double form, even though many teeth are spoken of, not just two).
A brush is a מִבְרֶשֶׁת ( ), though when the word was created in the 19th century, it may have been intended to be מִבְרָשָׁה ( ) (Wiktionary).
In any case, a toothbrush is a מִבְרֶשֶׁת שִׁנַּיִם ( ).
Likewise, an electric toothbrush is a מִבְרֶשֶׁת שִׁנַּיִם חַשְׁמָלִית .
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).