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.
Examples of signs and symptoms include: 1  Feeling sad or down. 2  Confused thinking or reduced ability to concentrate. 3  Excessive fears or worries, or extreme feelings of guilt.  Extreme mood changes of highs and 1  lows. Withdrawal from friends and activities.  Significant tiredness, low energy or problems sleeping.