There is the keratin option that is a combo of keratin with a little Fomo. And it gets washed out the same day unlike the old strong nprocess where you had to keep it on your hair for three days. It basically relaxes the curls and toes t look fake. I have naturally curly hair and have been using this process for the last year. It doesn't wash out, but as your hair grows the new growth and unstraightened roots make your hair curly again. So usually you need to have them apply a retouch to the root area every three to six months.
By the way, the fomo is far more dangerous for the peloqueros than for you. Altho highly irritating you won't get cancer from a few exposures. But they expose themselves a lot more and that's why it was banned. The keratin products don't give you that artificially straight look but sure make blow drying curly hair much easier and reduces frizz in the summer!