What are the characteristics of the primary (initial) bacterial colonizers of the tooth in dental plaque formation?: (A) Gram-negative facultative, (B) Gram-positive facultative, (C) Gram-negative anaerobic, (D) Gram-positive anaerobic
Answer is B. Streptococcal and Actinomyces species are initial colonizers of dental plaque. They are grampositive, facultative micro-organisms.