 A total of 345 adult subjects who are intubated and require mechanical ventilation will be randomly assigned to one of the three different tooth brushing frequency groups: once a day, twice a day or three times a day, up to a maximum of seven days. Teeth will be brushed with a soft child size toothbrush will take approximately 2 minutes. Following tooth brushing, the mouth will be rinsed with alcohol-free mouthwash and oral fluids will be removed with an oral suction tip. Moisturizing gel will be gently applied. The complete intervention requires approximately 15 minutes. 