Although poor oral hygiene is a huge factor, some people are more at risk of developing periodontal disease than others. Potential risk factors include:
Smoking or using tobacco products
Medical conditions that affect your immune system such as cancer, HIV AIDS and leukemia
Obesity
Poor nutrition and especially a vitamin C deficiency
Hormonal changes related to puberty, pregnancy or menopause
Prescription and non-prescription medications that cause dry mouth or which affect gum health