system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Which of the following is the predominant flora of the mouth?
assistant
The correct answer is  The eruption of teeth at 6 to 9 months of age leads to colonization by organisms such as Streptococcus mutans and S. sanguis, both a-hemolytic streptococci. An edentulous person loses a-hemolytic streptococci as normal flora. The predominant bacteria on the skin surface are S. epidermidis and Propionibacterium, an anaerobic diphtheroid.