Due to the low sugar diets followed by most DMs, many do not have a lot of carious lesions, restorations, or enamel decalcification.
Exceptions are the cervical caries noted in type 2 DM with high sugar diets, drink soft drinks, and those with xerostomia. If the patient also has oral fungal infections, the topical antifungal medications have high sugar content and can promote caries.