Participants will have their lips, mouth, gums, teeth, and saliva examined several times a day to determine their optimum oral care. They will receive standard care, such as flossing, brushing, rinsing with a mouthwash, and possibly use of an antiseptic spray that prevents bacteria from clinging to the teeth. Small samples of saliva (less than one-fourth of a teaspoon) and dental plaque will be collected the day the patient is admitted to the intensive care unit and again on days 3 and 5 of their stay in the unit. The saliva sample is collected with a small suction tube placed in the corner of the mouth; the plaque specimen is collected by gliding a tiny piece of paper over the surface of a front tooth. The samples will be examined for any bacteria not normally found in saliva.