Reducing inequalities in health has become one of the main health policy issues in the late 1990s. The Labour Government set up an independent inquiry into inequalities in health under Sir Donald Acheson to make recommendations on approaches to reducing health inequalities. This paper reviews the evidence on inequalities in oral health in Britain. Dramatic improvements in dental health in children and young adults have taken place in the past 30 years. The levels of caries in permanent teeth of children is low. Widening inequalities in oral health however exist between social classes, regions of England, and among certain minority ethnic groups in pre-school children. The main social class and minority ethnic differences in dental caries is in pre-school children. Wide district and regional differences also exist in prevalence of caries in young children. The area differences relate very strongly to deprivation. In adults the differences in decay experience is less unequal than in children but there are marked social class inequalities in edentulousness. Dental caries decreased in all social classes in the United Kingdom. The main causes of the inequalities are differences in patterns of consumption of non milk extrinsic sugars and fluoridated toothpaste. Improvements in oral health that have occurred over the last 30 years have been largely a result of fluoride toothpaste and social, economic and environmental factors. Oral health inequalities will only be reduced through the implementation of effective and appropriate oral health promotion policy. Treatment services will never successfully tackle the underlying cause of oral diseases.