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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 British Dental Association states that the first permanent molars begin coming through at around 6 years of age. This is also the time when the deciduous teeth begin to fall out. By age 13, most individuals have 28 permanent teeth. The wisdom teeth or third molars tend to appear, if at all, between ages 17 and 21.