* **Word Count Count:**725-850 words.
* **Content Focus:**The article should be a comprehensive-level-level-level-down structure, addressinging the core question: "Does vapain teeth?" by explaining the *cause*, *location*, and *comparison* of vaping stain and providinging *prevention* advice.
* **Instruction:**The article must be purely informative-based, avoidinging any health-related claims. Each section must be within its own, distinct-based on the provided.
* **Tone:**Must be strictl