When you suck on the gap between the teeth, there is blood and a bad smell, it should be gingivitis, periodontitis, it is best to ultrasonic scaling of the teeth of the whole mouth, and regularly check the oral hygiene after the operation. 1. When you inhale the blood between your teeth, there is a foul odor, mainly due to the long-term accumulation of food debris on the surface of the teeth is not cleaned up in a timely manner, resulting in bacterial growth and fermentation and acid production. Through ultrasonic cleaning can remove the plaque attached to the surface of the teeth, bleeding gums and bad breath symptoms will be significantly improved. 2. Prevent chronic gingivitis, periodontitis, usually maintain good oral hygiene, do morning and evening brushing, rinse after meals, regular oral hygiene check, generally every six months to a year for a dental cleaning. The gap between the teeth once sucked blood with a foul odor, timely to the hospital, so as not to delay the condition.