ENDOGENOUS DISCOLORATIONS
PRE-ERUPTIVE POST-ERUPTIVE
IMPERFECT DENTINOGENESIS DECALCIFICATIONS
IMPERFECT AMELOGENESIS CARIOUS LESIONS
DENTINAL DYSPLASIA ENAMEL EROSION
HYPERBILIRUBINEMIA FILLING MATERIALS
PHENYLKETONURIA DENTAL TRAUMAS
HAEMATIC DISEASES ENDODONTIC TREATMENTS
ENDOCRINE DISEASES  
DENTAL FLUOROSIS  
TETRACYCLINE DISCOLORATIONS  
Table 1: Classification of intrinsic discoloration.