The line that runs from each side of the nose to the corner of the mouth is called a "nasolabial line/fold".
This line/fold is seen in small babies when they have facial expressions. With aging these lines become much more visible. If these lines are pronounced, you can look tired, unhappy, or older.
Who has nasolabial lines?
In babies and children: Normally no nasolabial lines are seen, they become visible during facial expressions.
In adults: With aging, it becomes more pronounced without any facial expressions and even more pronounced with facial expressions.
What causes nasolabial folds?
With aging, with the sagging of cheeks due to the gravitational pull and decreased collagen production, the nasolabial lines become deeper.
Why do we treat nasolabial lines?
When nasolabial lines are treated, sad and tired look is gone. A younger, firmer face with no signs of sagging appears.