21.
d
(para 4-13b)
22.
c
(para 4-13c)
23.
a
(para 4-13d)
24.
a. high
b. right angles
(para 4-13d)
25.
d
(para 4-13e)
26.
b
(para 4-13e)
27.
a. fermentable carbohydrates; sucrose
(para 4-14)
b. between-meal snacks (para 4-15)
c. the patient (para 4-15)
28.
c
(para 4-16b)
29.
d
(para 4-16a)
30.
toothbrushing; flossing
(para 4-17)
End of Lesson 4
MD0513
4-20