Dental anxiety is common among both children and adults. Worry or nervousness over a visit to the dentist may be triggered by many factors. In some cases, a previous poor experience that caused pain or discomfort can cause anxiety about future dental work. A previous dentist who admonished you for poor home care may incite worry that your current dentist will do the same. Those who are claustrophobic or uncomfortable with invasions of personal space feel anxious about dental work during which a dentist or hygienist must be in close attendance. Some may not like receiving injections or worry that the anesthetic medication used during a dental procedure will not be effective. Additionally, the effects of anesthetic medication, such as dizziness, numbness, and nausea make many people feel uncomfortable about receiving medication during treatment.