Answered by Sayyidi Habib Umar bin Hafiz (may Allah protect him and benefit us by him)
How should kohl be used?
Kohl is a sunnah of the Prophet ﷺ . It is recommended to apply it before going to sleep. The best type of kohl is called ithmid. It should be applied three times in the right eye and three times in the left eye, similar to the way the hands and feet are washed during wudu. There is a weaker opinion that it should be applied three times to the right eye and twice to the left eye so that the total number of times that it is applied is an odd number.