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If the sutures fell out after 13 days that should be plenty of time for healing to continue to progress normally. As long as the "bone chips" and teflon are not obviously exposed and stayed in place. It is highly unlikely that the material was dislodged after 13 days of healing. The tissue should continue to close and heal and recontour normally. As long as you are comfortable, the healing process is likely proceeding in a healthy manner. Shrinkage of the gum and bone is to be expected - this is normal - although not always aesthetically pleasing.
It would probably be a good idea to let your dentist know, though, as there may be other considerations which he or she is aware of.
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If more of the teflon is now exposed, you should definitely call your dentist and at least inform him or her. While unlikely, this may require re-suturing to insure that the gingiva (gum tissue) regrows over the teflon / bone material.
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