I am tired of my curly perm, can I get my straight hair back?

If you simply want a looser curl, apply a "hot oil" treatment. This can be done as often as needed. If this doesn't relax the curl sufficiently, a perm may be reversed by applying another perm. Instead of the hair being wrapped around perm rods, it is gently combed straight while the chemicals are applied.. After processing, the hair is neutralized in the straight position. 

When straightening out hair with a permanent wave, you will not get bone straight hair. The curl, however can be reduced. Buy a perm for your hair type (resistant, color treated, bleached etc.) Be sure to read your perm directions before applying. Shampoo hair and towel dry. Apply the solution to the hair. Comb through, smoothing the hair out as straight as possible, do not comb it continually, just sit quietly without much movement until the suggested time has past. Rinse and towel dry, and apply the neutralizer with one combing and rinse after 5 minutes. Do not use conditioners until 2 weeks afterwards. You can use Phinish by KMS. It will not undo all your work and can help condition and remove perm odor. 

The disadvantage of this process is additional damage to the hair strand. Permed hair may be porous and dry. The damage may be further minimized by treating the hair with conditioners and reconstructors (after two weeks.) You may need a trim on the ends if for nothing else than unevenness from the straightening. Warning! Do NOT try to straighten a perm by using a chemical straightener! These products may contain lye and will melt your hair! Chemical straighteners are designed for natural curly hair (corkscrew pattern)or ethnic hair types. They are best left to a professional!