His hair is "ses cheveux" (masc.) in French.
a hair bun is 'un chignon' in French.
Long hair is "les cheveux longs" in French.
ginger hair is 'les cheveux roux' in French.
'messy hair' in french is 'cheveux en désordre'
You can say "Il a des cheveux gris" in French to mean "He has gray hair."
les cheveux
Coiffeur
mes cheveux
An hair tie is "un élastique à cheveux" in French.
"J'aime tes cheveux." = "I like your hair."
Dandruff-free hair translates as 'des cheveux sans pellicules' in French.