A 10-year-old patient comes in with a painful infected tooth. 1. Diagnosis: Acute pulpitis (tooth nerve inflammation). 2. Treatment: I prescribe an antibiotic. 3. Pharmacological step: I check the patient's weight to calculate the correct dose of Amoxicillin. 4. Administration: The patient takes the medicine every 8 hours. 5. Outcome: After 3 days, the swelling goes down, and we proceed with the root canal. 6. Follow-up: We ensure the patient finished the full course of medicine.