Help my fellow humans Producers of many mouthwash brands claim that using mouthwash prevents tooth decay. What is the best conclusion regarding these mouthwash brands and bacteria in the mouth?

Mouthwash contains ingredients that kill harmful bacteria.
Mouthwash contains helpful bacteria that produce oxygen.
Mouthwash does not really work because the growth of harmful bacteria cannot be prevented.
Mouthwash does not really work because bacteria is not known to directly cause tooth decay.

A5-year-old boy suddenly begins coughing while eating peanuts. he is choking and gagging. when he is brought to the ed, but he is awake and is able to give his name. on physical examination, his vital signs are stable. on examination of the chest, inspiratory stridor and intercostal and suprasternal retractions are apparent. which of the following is the most appropriate initial step in management? - allow patient to clear foreign object by spontaneous coughing- clear oropharynx with multiple blind sweeps with finger- position patient and perform back blows- stand behind patient and perform abdominal thrusts- perform emergency tracheostomy and take to surgery