The invisible aligners provide a method of tooth straightening without traditional braces. With the average case, the number of "aligners" in a series could be ________ aligners per case
a. 1 to 8
b. 10 to 30
c. under 5
d. none of the above
b
RATIONALE: The invisible aligners provide a method of tooth straightening without traditional braces. With the average case, the number of "aligners" in a series could be 10 to 30 aligners per case.
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