What Is the Difference Between the Df and DMF Indexes

Multiple Choice

What is the difference between the df and DMF indexes?

A) The df index is intended for use in children before the age of exfoliation.
B) The df index does not include missing teeth because of the difficulty in distinguishing primary tooth loss as a result of dental caries from those lost by natural exfoliation.
C) The df index is for primary teeth, and the DMF index is for permanent teeth.
D) The df index is popular in Europe, and the DMF index is popular in the United States.