How do dmfs, dmft and deft dental caries index differ from one another?

Teeth or surfaces : Dmfs: records the decayed, missing, filled (restored) tooth surfaces in a persons mouth. Dmft: decayed, missing, filled teeth in a persons mouth. Deft: is a count of the number of decayed, extracted, filled teeth in a persons mouth. We use these indices to measure caries (carvity) risks in patients, families, and populations of people.

Different measures: Defts; decayed missing filled surfaces dmft ;decayed missing filled teeth deft ;decayed extracted filled teeth all measure diseased conditions.