The dentist warns that the dangers of sugar-free drinks lie in their high acidity levels. “Both fizzy and non-fizzy sugar-free drinks can be surprisingly bad for your teeth," the founder of AI-powered dental app Toothfairy. “While sugar in regular drinks forms harmful acid in the mouth, sugar-free drinks often contain phosphoric acid, citric acid and tartaric acid, all of which can damage our teeth. The expert continued: "Tooth enamel isn’t like skin or the soft tissues in your mouth, which can grow back after minor damage. Replace sugar-free drinks with teeth-friendly alternatives like water (natural or sparkling), unsweetened tea, milk and diluted juice, which have little or no sugar in them."