The left and right symmetry of the human body is not always present, sometimes there is a larger one side. Including the face, the asymmetry that causes the face to appear tilted next to this could be a normal thing. Some possible causes of facial uncertainty include:

1. The development of different facial bones between left and right
2. The muscle of one side of the face is larger because it is more active as well, for example the habit of chewing on one side
3. Disorders of the facial joints, for example in the temporomandibular joint
4. Injuries resulting from accidents, blows, etc.
   Facial neurological disorders, such as Bell's palsy or stroke
5. Tumors on the face / brain

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To ascertain whether your facsimetricity is normal or no direct examination is required by your doctor. If it is an abnormality then the best treatment will be tailored to the cause found.

Some tips to minimize facial asymmetry:

Avoid chewing on just one side.
Keep oral hygiene to prevent tooth infection. Dental infections can affect a little on the structure of the face.

May be useful