ages when teeth come in
Teething usually starts around 6 months of age, but it can begin at any time between the ages of 3 and 12 months. Your children will develop 20 primary teeth by the time they are 3 years old. There are 5 different types:
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.