Consider the question. Of the following two sentences, which one is against common sense?
Options:
- Sentence A: "The man brushed his teeth with a shower sponge."
- Sentence B: "The man brushed his teeth with a toothbrush."

 What is the step-by-step reasoning process to arrive at the answer: Sentence A?

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
A shower sponge isn't used for brushing your teeth.