Who discovered gingivitis? what pathogen causes it?

Plaque bacteria: Many different bacteria called. Periodontal pathogens her responsible for gingivitis and your body's reaction to the plaque which leads to gingivitis ANUG or acute necrotizing ulcerative gingivitis was described in World War I concerning the soldiers in the trenches who got trench mouth Or ANUG. A landmark study was done by Silness and Loe 1965 on experimental gingivitis in man

Bacterial plaque: it is usually formed by colonizing bacteria like Streptococcus, Fusobacterium, Actinomyces, Veillonella, and Treponema and possibly Bacteroides, Capnocytophaga, and Eikenella, just to name few. There is no record of who and when the the gingivitis was discovered.