My hair is getting messy and I feel like doing hair rebonding. Has anyone heard of any risk in doing it?

There are no risks that I know of. Based on my experience, though, the chemicals tend to dry my hair and make it more unruly months later, when the rebonding wears off. I've opted for Keratin treatments every 3-4 months, my hair has retained its natural softness and wave while still having nice body and moisture. It looks a lot more natural than rebonding. You could give it a try!