About this calculator
The DMFT index summarizes caries experience in permanent teeth by counting decayed, missing due to caries, and filled teeth. The lowercase dmft version is used for primary teeth.
This calculator is mainly for dental education, oral-health surveys, and documentation support. It does not diagnose active disease, determine treatment, or replace a dental examination.
Uses the standard DMFT/dmft count: D or d decayed teeth + M or m missing teeth due to caries + F or f filled teeth. It is a caries-experience index, not a diagnosis or treatment plan.
Source-mapped dental epidemiology index
Educational estimate only; not a diagnosis, prescription, or treatment plan.
Formula and method
DMFT = D + M + F for permanent teeth. dmft = d + m + f for primary teeth. Optional context outputs show untreated decay percentage (D ÷ DMFT) and care/restoration percentage (F ÷ DMFT) when the total is greater than zero.
Limitations and when not to rely on this result
- Educational estimate only; not a diagnosis, prescription, or treatment plan.
- Result depends on accurate inputs and may not apply to complex medical situations.
- Use clinician judgment, local guidance, and urgent care pathways when symptoms are severe.
Frequently asked questions
What does DMFT mean? +
DMFT stands for Decayed, Missing, and Filled Teeth. It is a count of caries experience in permanent teeth.
What is the difference between DMFT and dmft? +
Uppercase DMFT is usually used for permanent teeth; lowercase dmft is used for primary teeth.
Should missing teeth always be counted? +
No. The M/m component should represent teeth missing due to caries when that can be determined. Teeth missing for orthodontic, trauma, or congenital reasons may be handled differently by protocol.
Does a higher DMFT mean active cavities? +
Not necessarily. DMFT combines current decay, past extractions due to caries, and filled teeth, so it reflects cumulative caries experience.
Can this compare populations? +
Yes, DMFT/dmft is commonly used in oral epidemiology, but survey comparability depends on examiner training, age group, dentition, and protocol.