and 66.7% of those with very poor oral hygiene.
[ncbi.nlm.nih.gov]
It is concluded that these entities occur only in children from low socioeconomic groups and have a multifactorial etiology consisting of poor oral hygiene and malnutrition
[ncbi.nlm.nih.gov]
Beside HIV infection, significant predisposing factors included poor oral hygiene, unusual life stress, inadequate sleep, Caucasian race, age 18 to 21 years, and recent illness
[ncbi.nlm.nih.gov]