Dental caries and periodontal diseases are plaque mediated diseases.Poor oral hygiene and inappropriate dietary behaviour can lead to increased plaque accumulation. Dental plaque is a biofilm that is formed over the teeth and prosthetic appliances placed in the oral cavity. As dental plaque is not easily visible to the naked eye, its removal is difficult and complex. In order to remove dental plaque and improve the oral hygiene, the use of disclosing agents has been recommended. Disclosing agents are preparations containing dye or other colouring agents which is used for the identification of bacterial plaque that can be distinctly seen providing a valuable visual aid and help in the maintenance of good oral health.