Diabetes symptoms can manifest in the mouth, paying attention to your dental health might help you be diagnosed and treated sooner. Because the earliest signs and symptoms of diabetes can manifest in the mouth, paying attention to your dental health might help you be diagnosed and treated sooner. Patients with type 2 diabetes are more prone to tooth decay. Medical specialists have proposed several plausible explanations for the relationship between the two illnesses. Tooth decay is caused by plaque bacteria interacting with carbohydrates in the mouth. Diabetics are more susceptible to periodontal infections due to their elevated blood sugar levels.