Bence Jones proteins are seen in multiple myeloma, not polycythemia vera.

A black line on the gingiva which follows the contour of the margin is due to mercury.

Scleroderma involves tightening of oral mucosa, periodontal involvement, and Raynaud's phenomenon.

The commonest site for carcinoma of the tongue is the lateral margin.

Carcinoma of the tongue is the most frequent oral cancer, and it typically arises from the squamous cells that cover the surface of the tongue. The lateral margin of the tongue is the part of the tongue that lies next to the teeth and the gingivae. This site is often exposed to various carcinogens, such as those found in tobacco and alcohol, which can increase the risk of developing cancer.

In the treatment of oral cancers, the fraction of total dose given in each appointment is typically around 150 rad.