# DMFT Index & Caries Prevalence Calculation

## Decay-Missing-Filling-Teeth Index

Decayed Teeth (Mean) = DT / NP

where,

- DT = numbers of decay teeth in examined people
- NP = numbers of examined people

Missing Mean (Mean)= MT / NP

where,

- MT = numbers of missing teeth in examined people
- NP = numbers of examined people.

Filling Teeth (Mean) = FT / NP

where,

- FT = numbers of filled teeth in examined people
- NP = numbers of examined people

DMFT Index = DT+MT+FT

where,

- DT = Decayed teeth mean
- MT = Missing teeth mean
- FT = Filled teeth mean

Caries Prevalence = (NP-CP / NP) x 100

where,

- NP = Number of people with caries prevalence (DMF-T > 0)
- NP = Total number of examined people

#selfnote