If bad breath is gone after scaling, it means that the previous bad breath was caused by plaque and calculus, or because the accumulation of calculus severely irritated the gums and caused gingivitis. Gingivitis can cause red, swollen and bleeding gums, as well as the symptoms of bad breath. After dental scaling, plaque and calculus are cleaned and the bacteria that cause bad breath attached to the calculus are eliminated, so bad breath is also eliminated. If you suffer from oral diseases such as gingivitis, dental cleaning can also have a therapeutic effect, and bad breath will naturally improve when your gums get better. But dental cleaning is not a one-off, on the one hand, you need to clean your teeth regularly, on the other hand, usually do a good job of oral care, be sure to brush your teeth in the morning and evening, but also carefully brush your teeth, pay attention to clean the gap between the teeth, to maintain oral hygiene to prevent bad breath.