Coke Zero, which has recently been rebranded as Coca-Cola Zero Sugar, is marketed as a healthier version of the original sugar-sweetened beverage, Coca-Cola Classic. 

It contains zero calories and sugar while providing the signature Coca-Cola flavor, making it an appealing drink among those trying to reduce their sugar intake or control their weight. Similarly to regular soda, drinking diet sodas like Coke Zero is associated with an increased risk of tooth erosion. 

One of the main ingredients in Coke Zero is phosphoric acid.

One study on human teeth noted that phosphoric acid causes mild enamel and tooth erosion.

Another study observed that Coca-Cola Light (Diet Coke), which differs from Coke Zero only in that it contains both phosphoric and citric acid, caused enamel and tooth erosion in freshly extracted cow’s teeth in just 3 minutes.

Still, keep in mind that citric acid has been found to erode teeth more than phosphoric acid, which suggests that Coke Zero may affect tooth enamel slightly less than Diet Coke .

Additionally, Diet Coke had less erosive effects than other beverages, such as Sprite, Mountain Dew, and apple juice.