DENTAL CARE

Bleaching of discoloured teeeth Discolouration of teeth is classified as 1 Extrinsic discolouration   2 Intrinsic discolouration EXTRINSIC DISCOLOURATION - It is found on the outer surface of teeth or acquired pellicle and is usually of local origin such as tobacco stains - The origin of the stain may be due to the following substances - 1 Metallic – Occupational exposure to metallic salts or medicines containing metal salts 2 Non Metallic like dietary components,beverages,tobacco,mouth rinces,medicaments,cromatogenic bacteria -Green colour discolouration is seen with the Nasmyths membrane  -Silver nitrate staines are other types of extrinsic stains that are impossible to eliminate without grinding as these stains penetrate the surface of the crowns   INTRINSIC DISCOLOURATION - These are stains within the enamel and dentin caused by the deposition or incorporation of substances within these structures such as tetracycline stains  - Amelogenesis imper...