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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 age six or seven, the first adult (or permanent) teeth come in. They are known as the first molars, or the six-year molars.. They come in at the back of the mouth, behind the last baby (or primary) teeth. They do not replace any primary teeth. Also at around age six, children start to lose their primary teeth.