Hair straightening is only safe if it does not contain formaldehyde in its composition, such as a progressive brush without formaldehyde, laser smoothing or hair lifting, for example. These smoothings are identified by Anvisa as an ethical smoothing and do not contain a formaldehyde substance that can cause burns, hair loss and even long-term cancer.
Thus, all straighteners containing other substances such as ammonium thioglycollate, thioglycolic acid, carbocysteine, guanidine hydroxide, potassium hydroxide, acetic acid or lactic acid, rather than formaldehyde, are safe and can be used to smooth hair.
- However.
- Such treatments should be performed in specialized hairdressers.
- As it is necessary to evaluate the type of hair and skin of the scalp to know which substance is most suitable in each case.
- In order to obtain not only the best result.
- But also avoid damaging health.
Pregnant women should certainly not straighten their hair with formaldehyde, however, other products should not be used either, especially during the first trimester of pregnancy, as it is not yet known whether they are completely safe for the baby.
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Before smoothing, it is important to take some precautions such as:
Also, if you start to feel itchy or burning on your scalp, you should stop straightening and washing your hair immediately with water, as the product probably contains formaldehyde.
If you’ve done a smoothing safely, now know how to take care of your hair to ensure the effect for longer.