Most teeth have some wiggle to them - not much but a tad but noticing an increase in mobiity is never a good sign - biting into something shouldn't be the casue unless the teeth were already in jeopardy. Actually most dentists would prefer you keep your natural teeth and will do whatever it takes to preserve them. Assuming you have not had previous trauma to the teeth in question including braces or crowns and do not wear a night guard or orthotic appliance - I would say either your teeth are shifting due to malocclusion (a poor bite), wisdom teeth eruption, or grinding or clenching or you are developing periodontal problems which needs to be addressed by a periodontist. Perio treatments can help reduce pockets around teeth which will prevent further erosion of underlying bone and allow gum tissue to tighten around the teeth making them more stable.
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