These five learning modules use text interspersed with illustrations and reinforcement exercises to instruct dental aide and dental hygiene students about jaw bones and gums, dental deposits, and dental instruments. The first four modules were prepared by Patricia Lind in both Spanish and English. "The Gum and Bone of Permanent Teeth" ("La Encia y el Hueso de los Dientes Permanentes") teaches about the different parts of the gum and their functions, how the bone supports the teeth, and how to distinguish between healthy and unhealthy gums and bone. "Dental Deposits" ("Depositos Dentales") teaches the learner about food, plaque, tartar, and stain deposits. "Dental Instruments for Examining the Teeth" ("Instrumentos Dentales para Examinar los Dientes") describes the dental mirror, explorer, and probe and how these instruments are used in an oral examination. The third module, "Sharpening Dental Instruments" ("Como Afilar los Instrumentos Dentales") underscores the importance of sharpening instruments and shows how to check and sharpen the spoon, spade, hoe, and file. The final module, "Basic Principles of Instrument Sharpening Using Chisels and Spoons" by Catherine Germano, lists the advantages of sharp instruments, identifies the different instrument parts, compares dull and sharp instruments, states the principle objective of sharpening techniques and the method by which an instrument is applied to the sharpening stone, and teaches the student the correct way to achieve a sharp edge. Each module concludes with a post-test and accompanying answer key. (AYC)