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| DMFT classification | Definition (Pitts 2001) |
| 0 | Sound (non‐diseased) |
| D1 | Non‐cavitated yet clinically detectable enamel lesions with intact surfaces |
| D2 | Cavitated lesion penetrating the enamel or shadowing |
| D3 | Cavity progressing past the enamel‐dentine junction into dentine |
| D4 | Cavity progressing into pulp |
DMFT = decayed, missing, and filled teeth.
