Pharmacies sell some substance to dissuade nail biting. It’s something you apply (similar to how you would nail polish) that tastes horrible, so you get turned off. I don’t recall what it’s called or how effective it is. I also don’t know if it would last for a three day Yom Tov, but it’s probably worth your while to look into it and try to break the habit. You can also try making your own concoction, I’d assume with cayenne pepper–you can search online for ideas.
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