1. Compare the structure and function of the upper and the lower digestive tract. 2. List the main exocrine and endocrine products of the gastrointestinal tract and their functions. 3. How do developmental anomalies affect the function of the digestive tract? 4. What is dental caries, and how can it be prevented? 5. What are the main complications of dental caries? 6. What causes periodontal disease? 7. What is stomatitis, and what are its causes? 8. What is the significance of oral leukoplakia and erythroplakia? 9. What are the risk factors for oral cancer? 10. How does oral cancer present clinically?