Can I Wait Til the 7th Week To Get My Fourth Treatment Of Laser Diode Hair Removal and Not on the 5th Week?

I have done three session of my face .but I have noticed that dark hair gone 50% and small baby black hair grown there.I am little worried that laser is working for me or not.I am medium color skin person with corse black hair. Other ,My practioner is saying if i will not getting 4th session on on 5 th week my hair will be back in before condition.I want to take session on 7th week before going for wedding.

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