Stress Weakens Teeth

In Brazil, 14 tests were done that showed that stressed-out people have a higher risk of periodontal disease. Also, increased levels of the stress hormone, called cortisol, might have a negative effect on the immune system and allow bacteria to invade the gums. You can lower stress levels by exercising and sleeping more.

Pollution Can Shut Down the Immune System

A study has show that air pollution can cause heart problems and shut down the immune system. This is caused due to pollutants in the ozone that can affect the lungs and the rest of the body and make it easier for the entry of bacteria and viruses. The pollution also causes the immune system to overreact and kill its own cells that it needs to fight bacteria and illnesses