Table 1. Lussi scores for dental assessment of erosion (ref. (34)).

Score	Surface	Criteria
	Facial
0		No erosion. Surface with a smooth, silky-glazed appearance, absence of developmental ridges possible.
1		Loss of surface enamel. Intact enamel found cervical to the lesion. Concavity in enamel, the width of which clearly exceeds its depth, thus distinguishing it from toothbrush abrasion. Undulating borders of the lesions are possible. Dentin is not involved.
2		Involvement of dentin for less than one-half of the tooth surface.
3		Involvement of dentin for more than one-half of the tooth surface.
	Occlusal/oral
0		No erosion. Surface with a smooth, silky-glazed appearance. Absence of developmental ridges possible.
1		Slight erosion, rounded cusps, edges of restorations rising above the level of adjacent tooth surface, grooves on occlusal aspects. Loss of surface enamel. Dentin is not involved.
2		Severe erosion, more pronounced signs than grade 1. Dentin is involved.