Teeth Grinding is usually done at night when you are asleep.
You may wake up with an aching jaw or find you clench your teeth a lot.
You may not know about it unless your dentist tells you, as you wear your teeth unevenly.

Teeth Grinding is an Anxiety Disorder a sign of internal stress which comes out when your conscious mind is asleep or deeply relaxed. 
In this state your sub-conscious mind can relieve the inner anxieties by agitated behaviour.

What causes Teeth Grinding?
                                                  The simple answer is you do 
From  a  very  young  age  we  are  told  not  to  cry  or  show  our  feelings  when we have up- setting experiences, so we learn to push any upsetting situations  into the  subconscious  part  of  our  mind  and  conveniently  forget  them. The  emotion connected to those experiences is repressed too and it can cause anxious feelings.
Over  the  years  we continue to repress our emotions, the anxiety  gets stronger as more and more  emotion  is  repressed  until  there  is  an emotional trigger. This  can be a bereavement, redundancy, failure of  a  marriage / relationship  or  business  or  just stress. 
The symptoms get stronger as we continue to repress the emotions in our life, first  you would just feel  anxious  or  tearful  then over  months  and  even  years  the  pattern would progress, anxiety attacks - stomach churning - panic attacks - insomnia  -  phobias would  get  stronger and finally  depression  sets  in. Other's  could  suffer  flashbacks  or  find  thinking  or  talking  about certain  aspects of their  lives difficult without feeling emotional or even breaking down in tears.

Repressed Emotion = Depression and Anxiety

The Treatment. If repressed  emotion  is  the  cause, then  it would follow that if we release the repressed emotion then the depression and anxiety will be removed as well. Unfortunately someone suffering with depression or anxiety can't remember consciously what it is upsetting them, but their subconscious knows exactly what memories are still upsetting them, so with the help of hypnosis we ask it. 
Hypno-Analysis. Combines Psychotherapy and Hypnosis and is used to discover the original cause of psychological problems. Every effect (your symptoms) must have a cause; once this cause is revealed, it is removed, bringing consequent relief from the symptoms.
Combining psychotherapy with hypnosis: rapid results can be achieved in a few weeks, usually 6 to 12 sessions, depending on the severity of the symptoms. The therapy allows us to ask the subconscious mind what is troubling it and it starts to recall all the memories that are the cause of the depression and anxiety. 
As the memories are recalled all the emotion connected to those memories is released. 

These symptoms respond  well  to Hypno-analysis; 
Depression, anxiety and panic  attacks, phobias, stress, ME, insomnia, IBS, sexual  problems alcohol abuse, eczema, self - doubt, psoriasis,  Low Self - Esteem, emotional traumas, headaches, eating  disorders, & many more psychosomatic symptoms