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The loss of an upper second molar is no big deal. A missing lower second molar can cause the upper molar to extrude, causing upper issues, and eventual need for the upper tooth to be extracted, but that's over a long period of time (think decades).

Also, the lower second molar area can be a tricky area to place an implant. sometimes, lack of bone, and a nerve that runs right though the area can make lower second molar implant placement very tricky. Not necessarily- but that's where your dentist can give you better advice. Each case depends.