Hi,
Treatment for Forward Head Posture
The chiropractic approach to Forward Head Posture is to relieve muscle and ligament tension by restoring the proper C-shaped curve of the neck. Because forward head posture occurs slowly over time, techniques involving sustained loading (application of sustained pressure in a specific direction) are often coupled with chiropractic adjustments and muscle rehabilitation. Enhancing the flexibility of the muscles of the front of the neck is also an effective strategy often overlooked by other practitioners.

Here's somethingelse i found on the net:

In head forward position the chin moves upward to keep the eyes horizontal, resulting in muscle tension in the neck and back of the head. Head forward position shifts the center of gravity of the body and creates various postural deformities:

● By jaming shoulders it drifts upper body backward and tilts the hips forward.
● In hunched position body becomes rigid and range of motion decreases.
● Tight chest and neck muscles impedes deep breathing.
● Rigid neck muscles limits neck movements which results in the reduction of endorphins, the
body’s pain controlling chemicals.
● Abnormal positioning of the lower jaw tightens facial muscles and triggers TMJ problems.

Treatment
Treatment of forward head position and slouched shoulders mainly includes physical therapy, postural training and muscle strengthening exercises. Ergogenik® is a resistance stretching device designed specifically for rdeveloping/strengthening neck, shoulders and upper back muscles. It holds the body in a perfect balanced posture, restores normal head position and corrects slouched shoulders.

I'll get somemore in future.

Cheers.