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Table 2 Tooth Wear Index (TWI) [6]

From: A plea for the development of an universally accepted modular tooth wear evaluation system

Score Description
  Buccal/Lingual/Occlusal Incisal Cervical
0 No loss of enamel surface characteristics No loss of enamel surface characteristics No change in contour
1 Loss of enamel surface characteristics Loss of enamel surface characteristics Minimal loss of contour
2 Loss of enamel exposing dentine for less than 1/3 of the surface Loss of enamel just exposing dentine Defect <1 mm deep
3 Loss of enamel exposing dentine for more than 1/3 of the surface Loss of enamel and substantial loss of dentine, but not exposing pulp secondary dentine Defect 1–2 mm deep
4 Complete loss of enamel, or pulp exposure, or exposure of secondary dentine Pulp exposure or exposure of secondary dentine Defect >2 mm deep, or pulp exposure or exposure of secondary dentine