Wisdom Tooth Extraction. Feeling Discomfort 6 Months After?

i am 28 and had all 4 of my wisdom teeth (all of them fully emeregd)extracted 6 months ago,for one of them (upper right which its eruption was also painful) i still feel sore and pressure like feeling at the extraction site gum. There is NO redness, NO swelling ,NO bleeding but i do not feel comfortable at the site even after 6 months. My regular dentist examined the site for 2 times and he says the gum has healed well and he does not understand the problem. By the way i do not have any sinus problem.

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