Diet has a local effect on tooth environment for e.g. type, consistency, frequency of food taken have a direct effect on the ph of oral cavity and microbial activity. However nutrition has a systemic effect. Systemically administration of nutrients affect development, maintenance and repair of teeth and oral tissue. Deficiency of various vitamins and minerals leads to diseases of mouth. Diet and Nutrition affect the oral cavity but oral condition/ diseases (Tooth loss, periodontal diseases, pain, surgery of oral cavity) may also affect individual’s ability to consume adequate diet. Vitamin A, C, E, folate, β Carotene and minerals like Calcium, Phosphorus, Zinc play a role in periodontal disease. Diet and nutrition are important in managing oral health and diseases. This review describes role of diet and nutrition in the prevention and management of certain oral diseases.