Everyone’s hair carries a positive electrical charge that is caused by dryness. Over time, this positive charge increases, and as your hair becomes drier, more hair cuticles open, creating ‘ragged’ unhealthy looking and feeling hair that is difficult to style. Flat irons and hair dryers will create negative ions. When the flat iron or hair dryer is heated, negative ions are created. The negative ions created by the appliance cancel out the positive hair charges, and while you glide down your hair with the iron, or blow dry, you smooth down those ragged open hair cuticles; smoothing instead of hair straightening.
Smoothing down the hair cuticles will seal in your hair’s own natural oils and moisture. If you use your flat iron to create curls it will still smooth down the hair cuticles allowing them to lay flat and frizz free, but still enable it to curl. This is very important to the health and look of your hair. An increase in natural oil creates healthier, more vibrant looking hair that is also more manageable and full of shine. This will also explain why your highlights look brighter when you use your flat iron too.
So in the flat iron world, nothing is more positive than tons of negative (ionic) activity!