The most common reason for why you get gum disease is age. Gum disease typically starts occurring in adults after age 45. Other factors that determine if or why someone gets periodontal disease are:
History of diabetes or high blood pressure – These are factors that often make people very prone to gum disease.
Genetics – If anyone in your family, such as your parents or grandparents, has had periodontal disease, you’re at a high genetic risk for it, too.
Social habits – For example, if someone’s been a smoker throughout most of their life, they are at a far greater risk of getting periodontal disease.