Smile does a lot more than simply letting the world know you are happy. It makes you more attractive, look younger and it also has numerous health benefits. Smiling can benefit perception at work, social life and in fact your smile can make other people happy. A smile can go a long way than just showing affection especially health-wise. Flashing just a grin of smile brings out affection, wins you friends and it thickens relationships and bonds of friendship.
Once the act of mastication is justified by the oral cavity, then there is the passage of the chewed substances into the next conveyer (the alimentary canal) which performs the next important process Digestion.