Nurses: Where is supposed to enter the nasal cannula?

My textbook says "nasal cannula (pin) are positioned so curving to the nose and the oxygen is directed upwards into the nose. "I do not know if this means that the branches bend the body or outside body. Which side is the direction "right" to have curved teeth? Turn to or from the body? I have an exam practice Tuesday, there will be time to ask the tutor again by then. Thanks pour votre aide.

The curve of the teeth to the body.

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