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Does anyone have advice for someone who has a (nervous?) habit to rub/scrape their fingernails together - thereby tearing away parts of the nail and surrounding skin (which is a rabbinic prohibition on shabbat)?

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up vote 5 down vote accepted

I believe that sometimes with nervous habits such as this one may be able to direct the energy into a more "parve" habit. Its possible that with focus tapping you fingers, perhaps quietly on your legs so as not to disturb others, may help someone not bother with their nails as much.

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'tapping your fingers' is actually quite a good suggestion –  Danield Oct 20 '12 at 19:26

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