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Table 1: Modified DDE index (FDI 1992)
| Mild | <30% of the tooth’s enamel surface area visibly disrupted (this encompasses the entire range reported in most other studies) | ||
| Moderate | 31 to 49% of the tooth’s enamel surface area visibly disrupted | ||
| Severe | >50% of the tooth’s enamel surface area visibly disrupted |
