Antibiotic resistance refers to the development of resistance to antibiotics in bacteria that cannot be killed by such antibiotics. If some bacteria develop resistance after the application of antibiotics, but the other characteristics of this bacteria are not too suitable for competition with other bacteria in the body environment, and a long period of time without the application of antibiotics, this bacteria may lose in the competition process, and thus the number of bacteria will be reduced, then the overall bacterial resistance will gradually disappear; but if repeated application of antibiotic treatment Not to kill these pathogenic bacteria, after this selection, the corresponding bacteria with drug resistance will have the advantage of survival, and the drug resistance will be very difficult to disappear.