The presence of fungi was histologically detected in marginal periodontitic and dental carious lesions in two cases. Two teeth with dental caries and marginal periodontitis were extracted and fixed with formalin. These teeth were decalcified and prepared for histological examinations. Grocott stain disclosed the brown pseudohyphae of Candida albicans with plaques in carious lesions and on the surface of dental roots with periodontitis. These morphological findings showed that C. albicans was present in not only marginal periodontitis but also in dental caries lesion in some conditions.