My child is 7 years old. She is getting the...

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How long does milk teeth last ?
milk teeth last sometimes till age of 12-13 years old 
Should you extract the milk teeth to let perminant teeth grow ?
you shouldnt , and should wait for the natural process of teeth changes 
Can you do it if you insisted ?
in this case , you should do the following :
1. consult dental doctor soon 
2. do an Xray image for your child teeth 
3. doctor after that will advise you about the best treatment 
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Kind Regards