Amazon calculates a product’s star ratings using a machine learned model instead of a raw data average. The machine learned model takes into account factors including: the age of a review, helpfulness votes by customers and whether the reviews are from verified purchases.
It takes quite a while for me to come back and write down the review as I need time to check if it really works. I am Asian with light skin and dark hair. it works perfectly on my skin. Of course, I mainly use it on my legs and underarms. About 6- 7 times later the hair grows very slow and much much less. I love it!