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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.
At What Age Do Babies Start Teething? According to the American Dental Association (ADA), a baby's first tooth often appears anywhere from eight months to a year of age. The last teeth to grow in are usually the molar, or back teeth, which often start making an appearance anywhere from 13 months all the way up to 33 months.