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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.
When Do Baby Teeth Come In? A babyâs 20 primary teeth are already present in the jaws at birth and typically begin to appear when a baby is between 6 months and 1 year. Most children have a full set of 20 primary teeth by the time they are 3.