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.
So easy and fuss free to use. They’re almost invisible on the skin, and stick super well without lifting for long wear- great for hiding under make-up. Really helps you to stop picking if you have that habit too, lol.