Dyes are substances that produce color in the most appropriate way and cause changes in the structure of substances. In leather, pharmaceutical, food, cosmetics, textile factories , etc.  It is widely used. Although it is estimated that around 7x105 tons of dyestuffs are produced annually worldwide, the majority of dyestuffs produced (54%) are used in the textile industry. As a result, approximately 10-15% of the paint used in the dyeing process ends up in wastewater. Dyes, It is resistant to light, temperature and oxidative deterioration. Therefore, dyes are not biodegradable, which causes negative toxic effects in wastewater, the environment and human health. The decrease in the amount of dissolved oxygen in water negatively affects the habitat of aquatic life. This materials are not biodegradable , live potentially for organisms toxic to be And some of dyes carcinogenic to be It poses a serious threat to human health due to threatening. In this study, the usage areas, physicochemical structures and health effects of malachite green, crystal violet and methylene blue dyes were examined in detail.