Read the following context and answer the question.
Context: It 's a curved wooden piece , looks like a bow , as in " bow and arrow " , and there 's a small can at the top although the can is n't really supposed to be there . You are supposed to use your mouth in place of the can , but the musician there put a can on there instead so it would be more sanitary for sharing with the kids . Maria played the washboard , and later tried her hand at a fiddle too . Then we went to the park next door .
Question: Why is a can more sanitary than a mouth ?
Answer:


Because of germs people have .