Pain is a general term that describes uncomfortable sensations in the body. It stems from activation of the nervous system. Pain can range from annoying to debilitating, and it can feel like a sharp stabbing or a dull ache. Pain can also be described as throbbing, stinging, sore, and pinching. Pain can be consistent, can start and stop frequently, or can appear only under some conditions. People respond to pain differently. Some people have a high tolerance for pain, while others have a low tolerance. For this reason, pain is highly subjective.
While most of us know that we need to schedule routine maintenance for our cars and even our heating and A/C systems before they break down rather than waiting for disaster to strike, sometimes we're not quite as conscientious when it comes to our own health and well-being. Sure, we might undergo an annual physical each year, but unless we're complaining of any particular symptoms, such a checkup might not amount to much more than a weigh-in, a stethoscope to the chest, and maybe a hammer to the knee to check if you're still alive and (literally) kicking.
There is no denying that many people love white teeth, on themselves as well as on others. Having white teeth is not only aesthetically appealing to most people but it also has a psychological reason behind it. According to Dr. Dacher Keltner, a professor of psychology at the University of California, Berkeley, most people are attracted to white teeth because they appear to be cleaner and healthier as compared to stained or yellow ones