5year old girl got 1grey hair...how to prevent from this???..any reverseable thing may happen

A. Okay we cannot reverse it because these things are irreversible but for further stopping of it I would recommend you to start using mustard oil that really helps a lot along with that also I’m going to recommend you to please focus on a healthy diet where you give more of home-made fresh food to the child fresh recipes fruit vegetables avoid giving junk and sugar-based food as that’s a very big reason for this and also also poor immune system can be because of the same