Genetics and underlying susceptibility play a big role in determining whether you suffer from gum/periodontal disease. Although the plaque/bacteria are the initial cause, your genetic makeup affects how you react to that plaque. For example, your response may be exaggerated if you are genetically more susceptible. Especially if you are young, have severe disease and no other risk factors, this may be the central reason as to why you have developed the disease.
Even if gum disease runs in your family, it doesn’t mean the treatment won’t be successful. In fact, treatment for gum/periodontal disease is generally highly predictable.