I used to comb the hair of Allah's Messenger (ﷺ) during my periods.

This hadith also reaches us through another chain
Sahih al-Bukhari Book 77, Hadith 140
← Previous Hadith A man peeped into the house of the Prophet (ﷺ) through a hole while the Prophet (ﷺ) was scratching his head with a Midrai (a certain kind of comb). On that the Prophet (ﷺ) said (to him), "If I had known you had been looking, then I would have pierced your eye with that instrument, because the asking of permission has been ordained so that one would not see things unlawfully."

Sahih al-Bukhari Book 77, Hadith 139 Next Hadith → The Prophet (ﷺ) used to like to start from the right side as far as possible in combing and in performing ablution.

Sahih al-Bukhari Book 77, Hadith 141