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Designed to stimulate the hair and scalp in a safe way
Each roller has 540 high quality and painless titanium micro needles
Ideal for use alongside other hair thinning products form Foligain
Can be used by men as well as women
Foligain Hair & scalp roller with 540 titanium needles
Directions
Wet hair and apply your favorite anti-thinning topical hair product and massage into areas of concern. Using gentle pressure roll the device over the scalp in one direction starting at the front of the head at the hair line and work your way down the back of the head. Roll over area 5-10 times changing direction.
Answer :
Some rollers say to replace them once a month, poorer quality ones become dull faster, but I found this one of good quality and it lasted me much longer. Once it starts to feel dull is when I replace it.