If after smoothening, the hair has been treated so as to stay straight and smooth then curling it may be a challenge. Even if you do end up curling it, they may not stay so for long.
Although smoothening does not use harsh chemicals as in straightening, it is a softer treatment and curling may be possible. But 10 days is too soon to be experimenting. Besides, since it is a milder procedure, curling on top of it may reduce the straightens that smoothening had achieved in the first place.
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