What to Expect From Keratin Treatments.

• Easy to Appy A stylist applies a keratin hair-straightening product to your hair and then uses the heat of a flat iron to seal it in. The process takes about 90 minutes or longer, depending on your hair's length. 
• Time-Saving Tresses: Keeping your hair straight, a keratin hair-straightening treatment could shorten your blow-dry time by 40% to 60%
• Farewell, Frizz: You can forget about frizzy hair after treatment. "You could walk out in moist or light rain and your hair won’t change,
• How Long It Lasts: Expect the results to last two to 2 1/2 months.

Keratin treatments won't make your hair break, but the flat-ironing might. "The hair breakage has nothing to do with the treatments and everything to do with the flat irons that are used to dry and seal the hair afterward," says New York dermatologist Neil Sadick, MD. "Some stylists may use a flat iron that is way too hot and scorches hair, making it break off."

"Keratin is more of a restorative treatment," Borday says. "Even if you have a good hair type, it still strengthens the hair shaft and makes your hair more resilient."

Sadick recommends checking with a dermatologist before getting a keratin treatment