Tooth pulps were collected by cracking teeth. Fibrous, calcified and putrescent pulps were discarded. For human teeth, the sample of pulps weighed 0.43 gm. Micro-lipid analyses were carried out using the Bloor oxidative procedures. The total lipids were 0.91% (moist weight), phospholipids 0.70%, and cholesterol 0.11%. For cow teeth, 214 incisor pulps weighing 33.72 gm. were collected. After lipid extraction, saponification of the residue gave 0.16% lipids unextracted. The total ether-soluble lipids (0.85% of moist weight) contained 50% unsaponifiable matter; of the saponifiable fraction, the fatty acids composed 76.6%, iodine number—72.3. Using the Twitchell procedure, 79.9% liquid fatty acids and 3.0% solid fatty acids were found.