Sally's primary teeth have been falling out at a rate of about four each year.This process will probably continue until she is approximately ___ years old.

Name: Sally's primary teeth have been falling out at a rate of about four each year.This process will probably continue until she is approximately ___ years old.
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Question

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Primary teeth, also known as baby teeth, typically start falling out around age 6 and are usually replaced by permanent teeth by age 12 or 13.

Sally's Primary Teeth Have Been Falling Out at a Rate