Reduced opening of mouth is not always because of teeth. If you have habit of chewing gutkha or betel nut your muscles get stiff n there are other reasons might affect the opening. For opinion you should consult a maxillofacial surgeon.
See that your last teeth are fully erupted in mouth, if not than consult a qualified oral surgeon. For mouth opening do mouth opening exercises, stop pan gutka or smoking and alcohol immediately.
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