Urge to bite is sometimes because of the initial stage of gums problem. When inflammation of gums is there then there is itching and one feels like either poking the gums or urge to bite. You need to schedule an appointment with a dentist for cleaning and maintain very good oral hygiene by doing brushing twice and flossing. You should do warm saline rinses. You can apply some gum paint available otc. For more info on gums diseases you can read this article... www.identalhub.com/article_signs-and-symptoms-of-gum-disease-20.aspx