This is correct. This is a reflexive verb that you are doing to yourself. This translates to, "Normally I brush the hair". If it was something like "Normalmente me cepillo el pelo de Anna" it would be incorrect because you are doing it to Anna, not yourself.
What is this..I would like to help you on this.
It's asking what size does Carlos need. Small medium or large, in the text look for where it says Chico, mediano, or grande.
Yo comiendo el chcolate - i am eating the chocolate
ud lee un libro - you(polite) read a book
yo duermo en la cama - i sleep on the bed
mi hermano y yo jugamos fútbol - my brother and i play football
yo bebo el vino - i drink the wine
yo aprendo el español - i learn spanish
yo hablo español- i speak spanish
mis amigos están aquí - my friends are here
nosotros miramos la televisor - we look at the television
yo canto la canción - i sing the song
What of the events of legend the stone of dead tea seem common and natural