To provide a dental stomatoscope apparatus convenient for dental treatment, capable of removing hot steam generated on the mirror surface of the stomatoscope, tooth dust and saliva anytime and speedily.

The apparatus comprises the combination of one stomatoscope, one air hose and one air compressor. The stomatoscope is composed of one long rod, a mirror sheet connected to the bottom end of the long rod, and a reflection mirror fixed to the surface of the mirror sheet. The long rod mounted on the stomatoscope is a hollow tubular body, and an air jet hole communicating with the hollow inside is bored on the bottom of the long rod. The angle between the air jetting direction from the air jet hole and the mirror surface of the reflection mirror is 135 degrees. One end of the air hose is connected to the long rod of the stomatoscope, the other end being connected to the air compressor. Air sent out of the air compressor runs into the hollow inside of the long rod via the air hose, and is blown toward the mirror surface of the reflection mirror through the air jet hole. Therefore, hot steam generated on the moor surface, tooth dust and saliva can be removed anytime and speedily with the blown air.