Hair smoothing is a temporary treatment that also goes by the names Brazilian blowout, keratin treatment, and protein treatment. The process involves saturating your hair with a formaldehyde solution followed by drying it out and using a flat iron to lock your hair in a straight position. However, the chemicals used for smoothing hair are not as strong as the ones used in hair straightening treatments. This makes this treatment less damaging. But, it is not ideal for all hair types.
The effects from the treatment last from 2 to 5 months and it is primarily recommended for hair that is wavy or ridden with frizz. This is because it doesn’t so much alter the structure of your hair so much as it aligns it. The treatment is not likely to be as effective with hair that is extremely thick or curly.