Place few drops of warm coconut oil onto your fingertips. Apply this oil on the clean eyebrows and massage it gently for few minutes. This process is used to boost up the blood circulation, which is essential to stimulate the healthy hair growth. Leave it on for few hours or overnight. After that, rinse your eyebrows and face with lukewarm water. Dry the skin and continue doing the same process regularly to thicken up your eyebrows.