if the hair is naturally curled, you do treatment also.... still the curls sure come back one, right? But at least with treatment, can tame the hair lahh.
Wah, he does not mind to sit hours for rebonding one ahh ?? Lots of patience, very rare attribute in a man.
Invest in hot iron to flatten the frizzy hair and you can do for him everyday then. But for dry hair texture, it might end up looking like 'kayu'.