It is recommended to trim, shave, pluck, or wax your underarm hair, pubic hair, and moustache regularly. It is also recommended to trim your nails regularly. This should be done every week or two and it is forbidden to leave it for more than forty days.
What the Qur’an and Sunnah Say
The Messenger of Allah said, “Five practices are part of natural cleanliness (fitrah): circumcision, shaving pubic hair, trimming the moustache, clipping nails, and plucking underarm hair.” (Bukhari #5891)
“The Messenger of Allah fixed the time for us to trim the mustache, trim fingernails, shave pubic hair, and pluck underarm hair: we cannot leave it for more than forty days.” (Tirmidhi #2759)
Shaykh Mustafa Umar