It is hard to use in fine hair and in too close hair to go into deep area, or may harm hair root, that will hurt body and become allergy, but this product can deep into hair root and protect the people who dyed their hair.
Wavy brush hold hair dye and combing easily, not to pull hair, especially that who has wavy hair or fizzy hair, easy to operate and convenient to use.
Maintenance:
Cleansing with warm water then dry it after using it.