Concerning the frequency of use of the roller to grow the beard, it depends on your skin habits and the size of the needles. Small needles of 0.25mm, you can use it 3 to 6 times a week Medium needles of 0.5mm, it will be only 1 to 2 times maximum per week. Large needles of 0.75mm, 1 time maximum per week. The very principle of microneedling is to give your skin time to regenerate and repair itself between each treatment.