Teaching Persian to non-Persian speakers or even Persian speakers who are exposed to standard and colloquial literature simultaneously is one of the most important educational challenges. In the meantime, popular literature, with its high cultural and linguistic capacity, can be an effective tool for teaching colloquial Persian. The present study, focusing on the works of Ahmad Mahmoud, especially in the outstanding novel "The Neighbors", examines the advantages and challenges of using colloquial expressions and popular dialogues in the process of teaching Persian. Ahmad Mahmoud's works are considered very suitable sources for this purpose due to their honest and vivid reflection of the social and cultural life of the Iranian people and their extensive use of slang terms and colloquial dialogues. This research shows that using these texts, in addition to increasing the motivation of language learners, also helps them to better understand linguistic and cultural differences, but at the same time it also faces challenges such as the difficulty of accurately conveying meaning and the possibility of confusion due to differences from the standard language. This research uses a qualitative approach and textual content analysis. First, the slang and street market terms and dialogues in the aforementioned novels were carefully extracted and classified; then, content analysis was conducted to examine and identify the educational potential of these terms. Finally, based on the data obtained, the potential benefits and challenges of teaching these terms in Persian language classes have been discussed and evaluated.