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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 arrival of second teeth occurs at 6 years +/- 6 months. With the exception of the wisdom teeth, the last of the secondary teeth come in around 12 years of age. Tooth eruption can be variable. Girls tend to get teeth earlier than boys.