Poorly performed primary surgery for cleft lip and palate patient is likely to compromise facial growth and dental development. Objectives: This study was done to identify all patients with complete unilateral cleft lip and palate (UCLP) who had undergone primary cleft repair and record their dental arch relationship. Methods: The patients were drawn from detail search from a cleft unit in the East region, West Malaysia. The criteria for selection were: 1. Patients born between January 1, 1980, and December 31, 1993. Primary repair of the UCLP had been performed within the East region. 2. All patients were Malays with no history of mental subnormality or other craniofacial anomalies. 3. No active orthodontic treatment other than that required before secondary alveolar bone grafting. The dental arch relationships were assessed using the Goslon Yardstick which ranks the study models of patients with cleft lip and palate into five categories: excellent, good, fair, poor and very poor. There were two examiners ranking the models. Results: The results showed that 41 samples obtained consisted of 24 males and 17 females. Mean age was 16.7 years. Most of the clefts were on the left side (71%). Only 41.5% (17) of patients were in the more favourable Goslon groups 1 and 2, whereas groups 4 and 5 represented 24.4% (10) of the total sample. A third of the cleft patients (34.1%) were found to be representative of Goslon group 3 (only fair outcome). These patients will require complex orthodontic and orthognathic treatment to correct their Class III malocclusion. Conclusions: Current surgical protocols, performed in this region should be evaluated and revised. This will enable significant improvement in treatment outcome to be achieved for future patients. Financial support: Vote F (F0385/2004A) granted by the University of Malaya, Kuala Lumpur.