Antibiotics may be prescribed before a teeth cleaning for patients with certain health conditions to prevent infection. Common reasons include: Heart Conditions: To avoid endocarditis (infection of the heart lining). Artificial Joints: To reduce the risk of infection after dental procedures. Weakened Immune System: If you have conditions like diabetes, cancer, or HIV. 💡 Tip: Always inform your dentist about any pre-existing conditions, as it helps determine whether antibiotics are necessary before your cleaning!