When do Milk teeth and Permanent teeth erupt?

Posted on May 30, 2015 in Dental Articles, Dental Education

We all have two sets of teeth in our lifetime – milk teeth (or formally known as deciduous teeth) and permanent or adult teeth. Milk teeth are the first set of teeth we have and there are altogether 20 of them. They usually start to erupt from around the age of six months until 3 years of age. At the age of 6, adult teeth sequentially erupt to replace the deciduous teeth which become loose and shed.

The charts below shows the ages at which the milk teeth erupts and shed, and approximate ages that the corresponding permanent teeth will erupt.英文恒乳牙

Points to note during mixed dentition stage (Ages 6-12+)

Mixed dentition stage starts when the first permanent molar appears in the mouth, usually at five or six years, and lasts until the last primary tooth is lost, usually at 10-12 years.1

At about the age of 6, the first permanent molar will erupt behind the four ends of deciduous teeth; it is also called the ‘six-year molar’. At this time, parents should remind their children to clean the ‘six-year molar’ by brushing to the very back tooth with a toothbrush and fluoride toothpaste thoroughly. This could avoid gum inflammation and tooth decay.

Generally speaking, milk teeth will exfoliate by themselves. There is no need to extract them because early loss of deciduous teeth will lead to irregular permanent teeth.

Teeth will become loose during mixed dentition stage. There may be mild bleeding during brushing. Parents should advise their children to keep good oral hygiene, including the area around the loose milk teeth, to avoid gum inflammation.

Why do baby teeth come out so easily?

6As the graphic illustrates:

As the permanent tooth moves through the jawbone ever closer to the surface, the root of the baby tooth above becomes shorter and shorter.

1. Finally a point is reached where it is no longer substantial enough to keep it anchored and it is easily dislodged.

2. It may seem strange that a child’s deciduous teeth are anchored so firmly for so long and then, right on schedule, just seem to fall out. There is an easy explanation for this. As the permanent tooth underneath continues to gradually erupt, its presence causes their root to resorb (dissolve away).