Thrush can recur even after it has healed. For children, if the oral environment they are exposed to reverts back to what it was before and they come into contact with germ-bearing dishes or come into contact with germ-bearing bottles or toys, it is easy to relapse in such cases. Also in the case of elderly people who have been using antibiotics for a long time, they may not quit the antibiotics because of their long-term use. After some more time, with the needs of the body, the condition, and the use of antibiotics again, due to their low immunity, but also may be long-term patients with cancer patients, may also then relapse again. For HIV-infected patients, relapse will occur soon because the underlying systemic disease has not improved. For patients who have relapsed, it is important to analyze what caused the relapse.