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. large dental volume,
. poorly positioned teeth,
. ill-adapted crowns,
. overflowing restoration,
. untreated caries, etc.
These reduce the body's immune defences and may thus facilitate the development of periodontitis.

An imbalanced or deficient diet (vitamin C or calcium deficiency, etc.) may weaken the body's immune defences.
Female hormones may influence the inflammatory reaction initiated by the bacteria and aggravate existing periodontitis. This phenomenon may occur:
. during pregnancy,
. during menopause.
Menopausal women receiving hormone replacement therapy are less likely to suffer bone loss than non-substituted women. The expected benefit must, however, be assessed by a healthcare professional before prescribing this type of treatment.
Stress:Stress, by altering your immune defences on the one hand, and by modifying your behaviour (sleep, diet, hygiene) on the other hand, may aggravate existing periodontitis.
Certain individuals may present increased sensitivity to periodontitis. These patients present with amplified inflammation, thus increasing the risk of developing severe periodontitis.
Risk factors and aggravating factors... in practice
. You smoke: stopping smoking is recommended.
Medical care may be of assistance.
. You are diabetic: a dental check-up at least twice a year is recommended.
. You are menopausal and not receiving hormone replacement therapy: a dental check-up at least twice a year is recommended.
. You are pregnant: a clinical examination to search for signs of periodontal disease from the onset of pregnancy is recommended, along with an examination 6 months after giving birth.
. For children and teenagers with gingivitis: a follow-up reinforced with age is recommended to prevent the progression of periodontal disease.
References :
Wolf HF, et al. Parodontologie. 3rd Ed. Paris, Masson; 2005. p.39-66.
Lézy JP, Princ G. Pathologie maxillo-faciale et stomatologie. Abrégés. 3rd Ed Paris, Masson : 2004. p.79-94.
Tenenbaum H. Classification des maladies parodontales . In Bercy P, Tenenbaum H. Parodontologie, du diagnostic à la pratique. 1st Ed. Bruxelles, De Boeck Université; 1996. p.49-64.
ANAES. Parodontopathies : diagnostic et traitements. Mai 2002.