The purpose of this research was to evaluate the effect of palatal expansion in the treatment of nocturnal enuresis. Enuresis still remains a problem experienced by children and the reason is unclear.Finding a final solution is being sought by the medical profession.Nocturnal enuresis may lead to numerous physical and emotional problems. Currently available treatment options showed satisfactory results in some cases.A treatment sample of 6 boys and 4 girls who ranged in age from 6 to 9 years were selected.Research showed that with palatal expansion (4-7 mm), patients could breath through their nose rathe their mouth; as a result, enuresis is reduced significantly.