Every country has different languages. Some are standard, while others are non-standard. This research looks at how often people in Iran use standard and non-standard language. It also looks at other factors like age, gender, education, occupation, and income. It also looks at how people feel about different language groups. The data were collected from 314 people in 10 Iranian ethnic groups living in Tehran. They were analyzed using SPSS software and Foucault's theories of power and discourse silence. The results show that people over 50 use their native language or dialect more because they have more social power. Men have replaced non-standard language with standard language. As education level rises, people use less non-standard language.  Non-criteria type is more common among retirees than other occupations. Those with a strong financial status have replaced non-criteria type with the criterion type. Those with a weak financial status have the most non-criteria type speech silence. Speakers of languages with strong attitudes toward language use are less likely to speak up in many social situations. They often use non-standard language instead of standard language.