COLLECTION OF SAMPLES FOR BLOOD CULTURE: To determine the prevalence of bacteremia, a peripheral venous blood sample (10 ml) will be drawn from each patient at the baseline (before any dental manipulation but after nasotracheal intubation) and 30 s, 15 min, and 1 h after the final dental extraction. Samples will be inoculated in BACTEC plus (Becton Dickinson and Company, Sparks, MD) aerobic and anaerobic blood culture bottles, and will be processed in the Bactec 9240 (Becton Dickinson).