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.
I was advised a surgery after I got ingrown nail on great toe. I ordered this product on same day delivery and it took only 2 days to straighten it up. As simple as that. Great product works fine. Would be better if had a normal nail clipper packaged into the kit.