An abscessed tooth is more likely to form if you: Smoking: Compared to non-smokers, smokers have a roughly twofold increased risk of developing tooth abscesses. Have xerostomia (dry mouth): Bacteria flourish in mouths with little saliva. Have poor oral hygiene: Bacteria are reduced with regular brushing, flossing, and tooth cleanings. Having a compromised immune system might make it more difficult to fight off infections. Diseases and drugs can impair your immunological response.