There is a AntiNail biting finger nail (clear) polish, it has some hot spice in it so when you bite you get a little reminder not to do that.

In the class room, well you could reward them at the end of the week (Candy or something) for everyone who didnt bite their nails.

Really you cant control what other people do, espically children.
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I wonder if it would be possible to develop a version of this method as a play to be attractive to children: http://www.dragosroua.com/how-to-create-a-habit-in-15-days/
Source(s):
http://www.dragosroua.com/how-to-create-a-habit-in-15-days/

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There are three different basic ways:

(1) Putting nasty tasting or spicy hot products on the fingernails. I guess you could even use jalapeno juice for a homemade remedy - it could be sadistic ! or garlic. But there are commercial items, as mentioned before.

(2) Putting something over the fingernails so they aren't readily accessible, such as bandages or gloves, something that makes them aware of the subconscious tendencies towards fingernail biting. I think that having a banaid with cartoon characters on it would help with the children. Or you could paint with them cartoon figures on gloves.

(3) You could cut the fingernails often so that there is nothing much to chew on.

You could also suggest to them other things that they can think or do, so that they can be a part of the process of retraining whatever it is within them towards a more neutral or productive behaviour.

Patience is needed to to this. It is like any other bad habit, it may take weeks or months.
Source(s):
http://ezinearticles.com/?The-Best-Cure-For-Adult-Nail-Biting-and-Cuticle-B...

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Why's it a problem?

I've used biting to trim my nails my whole life.

I think I've tried clippers a couple of times, but I couldn't really see the point.
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