Hi,
Acupressure is very different from trigger point therapy.
Acupressure is used like acupuncture to balance the flow of chi energy along the meridians.
Trigger point therapy releases trigger points which are areas of low neurological activity that when stressed transform into areas of high neurological activity with referred symptoms to other parts of the body.
It's normal to be sore afterwards for some hours or a day. Soreness for more than a day indicates that the therapist worked too hard, too deep or too long. More is not better. Appropriate pressure is most effective. Sort of like goldilocks, just right!
It is also normal for ordinary massages to not give long lasting results. When the symptoms return quickly it usually means that there are undiagnosed perpetuating factors. Some of the more common perpetuating factors in TMJ are a forward head position, pelvic misalignments and leg length difference.
An experienced well-trained clinical or structural type of massage therapist would know how to assess and evaluate for perpetuating factors. One example is the St. John Method Neuromuscular Therapist, there are others.
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~p