In many places around the world, indigenous communities use traditional medicine as a big part of their culture and understanding of health. Guava leaves have been traditionally used to treat various illnesses like rheumatism, diarrhea, diabetes, and cough. This study looks at how guava leaves can fight fungi and bacteria. Making a herbal mouthwash with guava leaves could be a good idea for keeping our mouths clean. To make the mouthwash, we boil guava leaves to get the helpful compounds. We can also add other herbs like mint to make it even better at killing germs. After brushing your teeth, you can use this mouthwash twice a day for about 30 seconds each time to keep your mouth healthy and fight off common mouth bacteria. Herbal mouthwash is made from plant extracts instead of chemicals. It's better because it doesn't irritate or stain, and it doesn't have alcohol [1]. Guava leaves have many helpful compounds that fight bacteria, like Flavonoids, Eugenol, Terpenoids, and Linalool. These compounds help make guava leaves a good choice for a mouthwash. Making this herbal mouthwash involves a lot of steps: researching, understanding, developing, extracting, testing, refining, consulting experts, packaging, and storing.