Objective assessments of clinical teaching are difficult; in oral surgery students must acquire a wide range of clinical and operative skills before qualifying as independent dental practitioners. A student log book system was introduced in Manchester University to monitor student progress and assess the efficacy of clinical instruction in oral and maxillofacial surgery following the introduction of the new 5-year BDS curriculum. Initial appraisal of third- and fourth year students undertaking 10-week clinical attachments revealed generally high levels of attendance (greater than 80%), and reasonable clinical experience (over 80% of students acquiring regular experience of dentoalveolar surgery and extractions). However, individual variation in both attendance and achievement was wide, and a persistent 8% of students did not appear to gain any practical experience. Students achieving less than the average course performance marks were thus easily identified and measures initiated to identify and correct their difficulties. Log book assessment also facilitated effective audit of teaching staff, clinical sessions and overall course delivery. The use of student log books to record clinical performance is recommended as a versatile aid to clinical teaching practice.