It is very frustrating to see fleas even after you have treated your home. However, re-treating your home immediately will not solve the problem. The best way is to wait a full 2 weeks so that you can target all the newly developing fleas which have just emerged from their protective cocoons. These fleas only come out of their cocoons after 10 to 15 days. Therefore, when you re-treat your home 2 weeks after the initial treatment, you will be able to kill the remaining population and bring your infestation under control.