How to Break Bad Habits
7 Habits Your Tots Need to Break and How to Help Them Do It
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Why it's bad: It's not just the fingers that suffer from this bad habit. Gnawing on nails can cause small fractures at the edges of your tot's teeth.
How to stop it: Kicking this habit requires some major nail maintenance. Use a nail strengthener to avoid any breaks, and keep kids' nails trim and smooth so they won't try to bite them into the perfect shape. If the problem is severe, invest in a bitter "polish" like Mavala Stop ($14). Your child will be so disgusted with the taste that they'll avoid putting their fingers in their mouth.
Source: Flickr user subharnab