Table 1 Smith and Knight tooth wear index: B = buccal; L = lingual; O = occlusal; I: incisal

0

B/L/O/I

No loss of enamel surface characteristics

1

B/L/O/I

Loss of enamel surface characteristics

2

B/L/O

Loss of enamel, exposing dentin on less than one-third of surface

I

Loss of enamel, just exposing dentin

3

B/L/O

Loss of enamel, exposing dentin on more than one third of surface

I

Loss of enamel and substantial loss of dentin

4

B/L/O

Complete enamel loss, pulp exposure, secondary dentin exposure

I

Pulp exposure or exposure of secondary dentin