Why is there a hole in the corner of the mouth of human beings? Is this typical of all people or is this only typical in some people or is this just
Why is there a hole in the corner of the mouth of human beings? Is this typical of all people or is this only typical in some people or is this just
![Preoperative view: 0.5 × 1 mm sized small pit is visible in midline of... | Download Scientific Diagram Preoperative view: 0.5 × 1 mm sized small pit is visible in midline of... | Download Scientific Diagram](https://www.researchgate.net/publication/273042656/figure/fig1/AS:668977579708421@1536508092572/Preoperative-view-05-1-mm-sized-small-pit-is-visible-in-midline-of-the-philtrum.png)