The basic question when singing or public speaking is whether to breathe through our mouth or nose. In the health world, our nose is designed for breathing since it filters out dust and other alien particles. Hence, the doctors most likely recommend us to breathe through the nose.
In terms of singing or public speaking, breathing through the nose is also recommended. However, it can also be combined with mouth breathing, depending on the person's habits when singing or speaking. The important thing is to use the air in our lungs or diaphragm wisely. The sound is more likely to crack or be out of pitch if we use a lot of air when singing or speaking, and it can make us less tired when we speak or sing.
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