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Across 3. Chemicals produced by the body that regulate various bodily functions. 5. Unlikely to cause an allergic reaction. 10. A disease that is caused by bacteria. 11. The hard outer surface of the tooth. 12. Chronic bad breath caused by poor oral hygiene, illness, or another condition. 14. Attaching a material to the surface of a tooth for cosmetic purposes. 16. A process that makes something free of living bacteria. 18. The skin surrounding the nail. 19. Having to do with the intestine, the part of the body that digests food. 20. A poison made by a germ. 22. Tiny living things that have only one cell; some bacteria can cause disease. 24. A part of the body that makes a fluid that is either used or excreted by the body; glands make sweat and bile. 25. A type of plant that has no flowers or leaves and isn't green in color (a mold is a kind of this) 27. An organ that holds urine.

Down 1. Small openings in the skin. 2. Gum disease, the first stage of which is gingivitis. (2 words) 4. A sticky film of bacteria that grows around the teeth. 6. A chemical substance that can stop the spread of bacteria. 7. The rapid spreading of a disease to many people at the same time. 8. Any plant or animal that lives on or in another plant or animal and gets food from it. 9. An inflammation of the gums that is the first stage of gum disease. 12. Loose skin near the base of the nail. 13. A chemical compound that is added to toothpaste and drinking water to help prevent tooth decay. 15. A substance made up of weak bacteria and put into the body to help prevent disease. 17. A tough protein produced by the body that forms the hair and nails. 21. Outer part of the ear; part of the ear that is visible. 23. When pus from a tooth infection spreads to the gums. 26. A covering, often made of porcelain, that is placed over a tooth that is damaged or for cosmetic reasons.