Sharks can famously replace their teeth, with new ones always growing as they’re using up the current set. 16 teeth — those that were completely intact and undamaged — were used for the pH experiment, while 36 more teeth were used to measure before and after circumference. The teeth were incubated for eight weeks in separate 20 L tanks, with the teeth exposed to more acidic water found to be significantly more damaged. While an altered tooth surface may improve cutting efficiency, it potentially also makes teeth structurally weaker and more prone to break. If the water is too acidic, the teeth automatically take damage, especially if acidification intensifies, the researchers said.