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The FDI World Dental Federation notation has a different system of numbering system from the previous two. [6] Thus, the right deciduous maxillary central incisor is known as "51", and the left one is known as "61". For the permanent maxillary central incisor, the right one is known as "11", and the left one is known as "21". [4] [page needed]
More colloquially, the condition may be referred to as gap teeth or tooth gap. In humans, the term is most commonly applied to an open space between the upper incisors (front teeth). It happens when there is an unequal relationship between the size of the teeth and the jaw .
Cupid's bow feature of a human lip. The upper and lower lips are referred to as the labium superius oris and labium inferius oris, respectively. [2] [3] The juncture where the lips meet the surrounding skin of the mouth area is the vermilion border, [4] and the typically reddish area within the borders is called the vermilion zone. [5]
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The mouth plays an important role in eating, drinking, and speaking. Mouth breathing refers to the act of breathing through the mouth (as a temporary backup system) if there is an obstruction to breathing through the nose, which is the designated breathing organ for the human body. [8]
Researchers found that people worldwide live 9.6 years longer than they are healthy — and in the U.S. the gap is more than 12 years. The U.S. has the biggest lifespan-health span gap in the world.
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