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Must one necessarily use a new toothbrush for Pesach on can he soak the toothbrush and scrub it in Listerine?

AFAIK, Listerine is KP, based on what I saw fairly recently, on I think, Star-K site. Wikipedia states its composition is:

The active ingredients listed on Listerine bottles are essential oils which are menthol 0.042%, thymol 0.064%, methyl salicylate 0.06%, and eucalyptol 0.092%.[14] In combination all have an antiseptic effect and there is some thought that methyl salicylate may have an anti inflammatory effect as well.[15] Ethanol, which is toxic to bacteria at concentrations of 40%, is present in concentrations of 21.6% in the flavored product and 26.9% in the original gold Listerine Antiseptic.[16] At this concentration, the ethanol serves to dissolve the active ingredients.

I used Listerine as an example, but, if one scrubbed the toothbrush extremely well so that there was no visible food and, just to be sure, soaked it in Listerine or some similar antiseptic that would make any left-over food in the bristles invisible, it sounds to me that this would be fine. Or is there some other concern with toothbrushes beyond this?

  • Since a toothbrush is only used with cold water, why would one need a new one at all? Why not simply clean it off from visible food leftovers? – Danny Schoemann Apr 1 '15 at 10:00
  • @DannySchoemann I'm uncertain what the "cold water" aspect is about. Also, AFAIK, chametz has a bigger problem than mere visibility. I have porcelain serving plates that I use only for cold items (e.g. cake plates). Yet, I don't believe that I can use them for Pesach. – DanF Apr 1 '15 at 13:35
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    Cold Water: See Shulchan Aruch, Orach Chaim 451:22 סימן תנא - דיני הגעלת כלים - toratemetfreeware.com/online/… - where he states: כָּל הַכֵּלִים, אֲפִלּוּ שֶׁל חֶרֶס, שֶׁנִּשְׁתַּמֵּשׁ בָּהֶם חָמֵץ בְּצוֹנֵן, מֻתָּר לְהִשְׁתַּמֵּשׁ בָּהֶם מַצָּה אֲפִלּוּ בְּחַמִּין - with certain caveats. Maybe you can use your cake plates. :-) – Danny Schoemann Apr 1 '15 at 13:56
  • BTW: You cannot Kasher with Listerine - only with clean water. So either you need new ones, or you simply need to use water to wash them. – Danny Schoemann Apr 1 '15 at 13:57
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    If you eat chametz close to the deadline, there is an extra hour when you are allowed to own chametz but not eat it. (You destroy your chametz during this time).During that time you should clean your teeth and floss and at least get rid of chametz on the toothbrush the best you can. – CashCow Apr 1 '15 at 16:51

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