Claim: Sugar causes tooth decay

The claim that sugar causes tooth decay is mostly true, supported by numerous health organizations and studies indicating a strong link between sugar consumption and dental caries. The World Health Organization and various systematic reviews highlight that sugar intake, particularly free sugars, is a significant risk factor for tooth decay due to its role in acid production by plaque bacteria. However, some sources argue that sugar itself does not directly damage teeth, but rather feeds bacteria that produce harmful acids, which complicates the narrative around sugar's role in dental health. This distinction is important but does not negate the established connection between sugar and tooth decay. The models diverge sharply — treat this as higher-uncertainty. Perplexity comes in highest (95%), while Gemini is lowest (50%). OpenAI expresses higher confidence than Gemini on this claim. While the majority of evidence supports the claim that sugar contributes to tooth decay, some sources dispute this by suggesting that sugar does not directly harm tooth enamel. They argue that it is the bacteria that metabolize sugar and produce acid that leads to decay, not the sugar itself. This perspective introduces nuance to the claim, indicating that while sugar is a contributing factor, the mechanism of decay involves additional biological processes. However, this does not fundamentally alter the consensus that high sugar intake is a significant risk factor for dental caries, thus maintaining the overall validity of the claim.