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You can use minoxidil
5% for long ,but then later on switch over to 2% to maintain the results. You have not mentioned your gender ,if you are male then only you should use 5% for long.we don't prefer 5% for females.
There is always a chance that after leaving minoxidil ,gradually there may be hair loss .
The only permanent solution for baldness
would be HAIR TRANSPLANTATION
.There are couple of techniques like FUE (DHI) & FUT .You can get details in my website www.skinhairclinic.com.