Penetration of a liquid adhesive into human artificial and natural white spots, both acid-conditioned and nonconditioned, was studied. All artificial white spots showed penetration of the adhesive. Acid-conditioned natural lesions exhibited penetration to a lesser amount than in vitro lesions. Penetration in nonconditioned natural lesions was not apparent.

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Histologic study of the capillary bed contained within the pulps of human teeth shows components which differ as to the presence or absence of muscle in their walls. The vessels which supply the capillary network of the pulp are metarterioles and precapillaries with their sphincters. Arteriovenous anastomoses are also found in the pulp.