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've had sensitive teeth for a while, so have switched now to exclusively toothpaste for sensitive teeth. I've tried a few, this is probably my top pick along w/ Sensodyne. I'll buy whichever is cheaper at the time