الفهرس 
AcknowledgmentOnly 14 pages are availabe for public view
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Abstract
The habit of chewing tender leaves and twigs of khat is deep-rooted in Yemen. Khat cultivation causes several economical, environmental, social and medical problems in Yemen. This habit also has negative effects on the teeth and periodontal tissues, accordingly; the aim of this study was to evaluate the clinical, histological and immunohistochemical effects of khat chewing on the periodontium.