Mouth-to-mouth rescue breathing is an essential tool in first aid that involves blowing air into a patient’s lungs when their respiratory system is not working. But while rescue breathing is most often associated with CPR, it’s not always used during resuscitation. People often ask, “What is the indication for mouth-to-mouth rescue breaths as opposed to hands-only CPR?” To perform mouth-to-mouth breathing effectively, you need to know which situations require it and which don’t. So, what is the indication for mouth-to-mouth rescue breaths during CPR, and when should you use other CPR methods? Read on to find out.