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Air has 21% oxygen and about 0.05% co2 in it, the air we breathe out still has 16% oxygen in it, and 5% CO2. That 16% of oxygen is still more then the 0% of oxygen they are getting from not breathing. Obviously more oxygen is better, which is why trained professionals use a bagged mask that is connected to pure oxygen and help the patient oxygenate the blood this way during CPR, but mouth to mouth CPR is still better then no breathing at all.
The reason why we don’t use all the oxygen in the air is because our blood is already fully saturdated by the time we claim 5% of the oxygen, and so our blood physically can’t hold anymore, which is a good thing that we leave behind 16%, because that way if the air is really thin like up on a mountain or if the percentages change like when another gas is released and mixes with air, we can still breathe and survive for a bit because there is wiggle room. If we needed to use up all 21% of the oxygen in the air every time we breathe, then we would be in trouble if we breathed in air that only had 18% oxygen because it wouldn’t be enough and we would die
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