What the Mouth and Teeth Do. The first step of digestion involves the mouth and teeth. Food enters the mouth and is immediately broken down into smaller pieces by our teeth. Each type of tooth serves a different function in the chewing process. Incisors cut foods when you bite into them. The sharper and longer canines tear food.
CFS is most common in women ages 30 to 50. The hallmark symptom is persistent and profound fatigue, which often worsens after physical or mental exertion. Symptoms may also include muscle aches, headache, and extreme fatigue. The main symptom of CFS is extreme tiredness that is: New.
Depression is the most common major mental illness and is characterized by both emotional and physical symptoms. 1  Symptoms of depression are: 2  Intense sadness and despair. 3  Anxiety. 4  Loss of ability to concentrate. 5  Pessimism. 6  Feelings of low self esteem. 7  Insomnia or hypersomnia. 8  Increased or decreased appetite.