Back ground: The aim of this study was to evaluate the characterized well-defined a cute periodontal abscess clinically and microbiology. Material & Method: Thirty patients were selected for this study; clinical examination was carried out recording the following variables: pain, edema, redness, swelling, bleeding on probing, suppuration, tooth mobility and probing pocket depth. Microbiological samples were taken using dark field microscopy. Results: The results show that 60% of the abscesses affected untreated periodontits. Ninety percentage of the patients reported pain and more than 75% of the abscesses had moderate to severe score related to swelling, edema and redness. Bleeding occurs in all abscesses, while suppuration was detected in 70% and 85% of teeth presented some degree of mobility the mean associated pocket was 7.1 mm. The microbiological examination showed that the spirochetes were the predominant bacteria (41.8%) while coccid bacteria were present in lower number (19.22%) . Conclusion: The periodontal abscess has clear clinical characteristics and usually associated with sever e periodontal distraction. The lesion has a large mass with a large prevalence of periodontal pathogen.