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Damaged hair will only become more damaged as you put it through the daily straightening process, and you won’t be able to get the sleek look you’re after. If you’ve got split ends or inches of damage, start fresh by having your stylist cut them off. If you really don’t want to cut your hair, it may be possible to repair some damage over time with products containing oils and moisturizers. This is not a quick-fix, though—it could take two to three months to see improvements. Use your smoothing (or strengthening) shampoo and conditioner and rinse them well. Depending on the product(s) you choose, you may need to apply it while your hair is still wet. Some products direct you to use them on damp hair, while others are for dry hair and you should apply them immediately before using the flat iron. Whatever the case, be sure to follow the directions on the packaging for best results. Use only as much product as you need for your specific hair type and length. Using too much product could result in hair that is weighed down and looks greasy, rather than sleek and shiny. Allowing your hair to air/towel dry for at least part of the time will reduce the amount of heat—and thus drying—endured by your hair. If you are able to straighten and style your hair to your satisfaction after allowing your hair to completely air/towel dry, this is a great option for reducing damage. Blow-drying your hair adds more heat, which can cause additional damage, but many people who straighten their hair also need to blow it dry to get the look they desire.  To create volume, blow-dry by lifting at the roots.  If you have thick hair, you will want to apply tension with a brush as you dry—this will help to get the hair as smooth as possible.  Do not attempt to straighten your hair until it is absolutely dry. If you hear a sizzle, stop!
Keep hair trimmed. Wash your hair. Apply your heat protector. Partially air/towel dry. Blow-dry your hair.