From September through November 1996, 158 of 844 patients at the general dentistry clinic of Tufts University School of Dental Medicine completed surveys concerning their fear of dental treatment. High levels of dental fear affected 65 percent of the respondents, with patients under the age of 45 reporting higher levels of fear than patients ages 45 years and older. Results showed that the four most common causes of fear in patients occur when the dentist seems rushed (65 percent), when the patient feels uninformed (50 percent), when the patient worries if the local anesthetic will be effective (43 percent), and when the patient's feelings are neglected (40 percent).