The main drugs used to treat bad breath in moderate periodontitis are metronidazole and amoxicillin. Clinical appearance of moderate periodontitis due to inflammatory stimulation, inflammatory secretions increase, may produce halitosis symptoms, can be in the periodontal routine treatment at the same time, under the guidance of the doctor to use anti-inflammatory drugs, such as metronidazole, amoxicillin, can alleviate the inflammation, but also the use of ciprofloxacin mouthwash mouthwash. In the treatment of moderate periodontitis process not only need to use medication, but also need to pay attention to personal oral hygiene, keep your mouth clean, diligent brushing and rinsing, you can use dental floss or dental floss to remove residual substances, but also need to pay attention to personal diet, light diet, to avoid the impact on normal life.