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 only buy these coz they work so well with my curly hair. But after purchasing 6bottles realised they were all out of date 19/10/2019. Bought 05/20- Wasnt a quick sale coz i bought them for full bottle price. Aound $6.99 each. Giving 3⭐️ coz although a great product, not happy buying out of date bottles &paid full price!