Objectives: Dental anxiety may play a central role in the oral health status and treatment outcomes of oral surgical procedures. The study aimed to investigate the effect that brief written information has over patients undergoing oral surgical procedures and to evaluate factors that may cause anxiety. Method and Materials: A prospective study was performed on 38 mandibular third molar surgery patients (mean age 26.74 ± 6.44 years) and 56 implant surgery patients (mean age 49.13 ± 15.11 years). Each group was divided into two subgroups, and written information, explaining what they could expect and details about the procedure, was provided to study groups. The Spielberger State-Trait Anxiety Inventory was used to measure state (STAI-S) and trait anxiety (STAI-T). The visual analog scale (VAS) was used for pain scores preoperatively and on days 1, 3, 5, and 7. Demographic data and intraoperative behaviors of patients were recorded. Results: All groups had similar anxiety scores at baseline. Preoperative STAI-S and VAS scores were similar between study and control groups (P > .05). Study groups showed significantly lower mean intraoperative anxiety levels (P .05). The implant group had a significantly lower VAS score (P .05). STAI-T and preoperative STAI-S were not related to VAS. Postoperative STAI-S and VAS and recuperation were correlated (P .05). Women showed significantly higher anxiety and VAS scores. Conclusion: The patients who received written information did not report lower anxiety scores. However, improved patient cooperation could be achieved with this method. Different surgical procedures may cause anxiety for different reasons. Keywords: brief information, dental anxiety, dental implant, Spielberger State-Trait Anxiety Inventory, third molar surgery