Yes, but it must be unhealthy. Not recommended, because the oil that has been fried many times contains carcinogens. If it is soybean oil, peanut oil, corn oil or even animal oil, it is not recommended. If it is salad oil, look at the color. If you can still see yellow (similar to black or brown, don't use it), you can try the following, fry some food, and throw it away if it doesn't taste good. If it is olive oil, olive oil is the only oil that can be eaten after frying. At the same time, the oil used as food and skin care products is better than other oils, but frying things with olive oil is definitely not as delicious as other oils, because the main function of olive oil is to make salads, mix cold dishes, or make soup or light dishes.