Listening Exercise
Vocabulary:
the thing with A is (that) B: (phrase) used when introducing a key point to be remembered about that topic
decay: (v.) rot, decompose
mummy: (n.) the preserved body of a dead person, usually from ancient Egypt
mandibular: (adj.) relating to the jaw
pitting: (n.) a condition where the surface of the teeth develops small holes or irregularities
gingivitis: (n.) a gum disease causing redness and swelling
wear and tear: (n.) the process of something deteriorating in quality or condition from age or overuse.