Table 2. Molar and incisor hypomineralization severity scale.²¹.

	Mild	Moderate	Severe
Crown appearance	Demarcated opacities* not involving the load-bearing area of the molars	Intact atypical restorationt†	Post-eruptive enamel breakdown‡
Enamel loss	Isolated opacities	Involvement of occlusal or incisal 1/3 of teeth, but without initial post-eruptive enamel breakdown	Post-eruptive enamel breakdown, usually severe
Caries	No associated caries	Caries limited to one or two surfaces and without cuspal involvement, and possible post-eruptive enamel breakdown	Substantial progression of caries
Sensitivity	Normal dental sensitivity	Child usually exhibits normal dental sensitivity	A history of dental sensitivity
Esthetics	No parental concerns	Parental concerns	Parental concerns

^*A demarcated defect presenting as a change in enamel translucency; variable in degree. Enamel is usually of normal thickness and has a smooth surface. It can be yellow, brown, or white in color.

^†Restorations on the posterior teeth that extends to the buccal, palatal, or lingual side. Some opacities at the borders of the restorations are common. Facial restorations not related to dental trauma are evident on the anterior teeth.

^‡A defect which indicates loss of tooth surface post eruption. Pre-existing demarcated opacities are often associated with enamel loss.