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1 Most experts think that by 6 years of age, when the second teeth start to come in, is the proper age to treat the habit. 2  We like to see the habit discontinued because it can push the new teeth into poor alignment. 3  Finger sucking encourages the upper teeth to protrude.
The majority of people have most of their permanent teeth by age 13, followed by the wisdom teeth, which usually erupt or become impacted between the ages 17-21. They are called wisdom teeth because they typically arrive during the time of life when a person gains maturity, and thus wisdom.