He rarely brushes his hair:

Il se brosse les cheveux rarement

I remember the rule that adverbs go after the verb, but I think it looks weird:
Il se brosse rarement les cheveux.

Do you shave everyday?:
Est-ce que tu te rases tous les jours?

is the inversion:
te rases-tu tous les jours?

Merci beaucoup!

rarement (the adverb) could go right after the verb = more common in French!

perfect on the inversion, although you might like to capitalize the first word = "Te"

Sra (aka Mme)