A chemical straightener will last permanently on the hair straightened, but the procedure has to be repeated as the hair grows as the new growth will maintain the curl pattern and will grow in curly.
Chemical straighteners are permanent. They will last until there is virgin hair, or new growth, which will appear generally at a rate of half inch per month.
Its may last even for a couple of months but it will damage your hair extensively making it very brittle. Better choose the right salon and chemical to apply.
