Children in mixed dentition period have a high risk of dental caries because they often eat carbohydrates, especially sucrose between meals. 5-10 minutes after consuming sucrose, oral pH drops below 5 or 5.5. One of the preventive measures to prevent the decrease of salivary pH is chewing sugar-free gum as xylitol or sorbitol. The content of xylitol and sorbitol in chewing gum has the effect to…