Which of the Following Statements Regarding Oral Health in Early

Which of the following statements regarding oral health in early childhood is FALSE?

A) Since the 1970s,there has been a dramatic reduction in tooth decay with a slight reverse in this trend since the 1990s.
B) Pain resulting from oral infection can slow growth by interfering with normal sleeping and eating patterns.
C) Children from middle-class families have more untreated cavities than other children.
D) Thumb-sucking past age 4 can affect the permanent teeth.