Brazilian straightening without formalin is the most popular straightening, it still contains chemical components.
2. Tannin smoothing, taninoplasty, enzymotherapy is a 100% natural Brazilian smoothing, devoid of any chemical substances.
3. French smoothing is 100% natural and the only one containing diamonds, it promises results superior to Brazilian smoothing and tannin, with a smoother and shinier effect, softer hair, for a more lasting effect.