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Aim. The study aims at determining some possible significant differences in the subgingival microbial profiles of patients with generalized chronic periodontitis (GCP) and generalized aggressive periodontitis (GAP), as a tool in helping with differential diagnostic. Materials and methods. 20 subgingival fluid samples (10 from GAP and 10 from GCP patients) were subjected to a Real-Time Polymerase Chain Reaction technique in order to determine the prevalence and the counts of 9 periodontal pathogens (Aggregatibacter actinomycetemcomitans, Porphyromonas gingivalis, Treponema denticola, Tanerella forsythia, Prevotella intermedia, Peptostreptococcus micros, Fusobacterium nucleatum, Eubacterium nodatum and Capnocytophaga gingivalis). Results and discussion. Fusobacterium nucleatum was singnificantly correlated with the aggressive periodontitis group, but no significant differences were found for the other 8 periodontal bacteria. Conclusions. The prevalence or count of some periodontal pathogens could help clinicians make an easier differential diagnostic between GCP and GAP, however further studies, conducted on larger population samples, are still needed.