A.C.
Our 8 y/o used to bite her nails when she's nervous or bored, so we started buying xylitol sugar free gum. It helps prevent cavities and ear infections and has been used in Europe for over 30 yrs. It's basically fruit sugar. Safe for those with diabetes as well. We give her a bottle of gum and whenever she feels like chewing, she'll pop one in her mouth. Most of the time, we find xylitol gum at a Korean market b/c most of the American brands at the supermarket has the ingredient, aspartame, which can cause strokes. In any case, the gum chewing really helped and she no longer bites her nails. You can also find xylitol gum/candy online. We also buy gum and sparx candy at www.luckyvitamin.com, since shipping is $6 (flat rate). Hope this helps your daughter! Good luck!