Abstract
Observations were made of the changes in the nerve fibers of dental pulp. Investigations were made of the teeth taken from tumor lesion diagnosed as being squamous cell carcinoma. Nerve fibers disappeared gradually, beginning with those near the center of tumor lesion, along with degenerative changes of the dental pulps. Whether such findings were caused by the tumor itself could not be concluded due to the limited materials and to the types of therapy to which the materials had been subjected. The author intends to continue investigations on a various kinds of tumors.