北师大版高中英语模块7--Unit 21 Lesson1-1
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    [00:02.81]Unit 21 Human Biology Lesson 1 Chewing Gum

    [00:09.19]TO CHEW OR NOT TO CHEW...

    [00:12.21]Diet specialists regularly inform us

    [00:14.82]that it is important to chew our food properly.

    [00:17.74]They suggest that if we chew our food

    [00:19.77]until it is soft in our mouths

    [00:21.74]and then swallow it,

    [00:23.15]it will help our bodies digest it better.

    [00:25.96]So,does chewing gum have any effect

    [00:28.32]on this process?

    [00:30.52]One obvious benefit of chewing gum

    [00:32.71]is that it fights bad breath.

    [00:34.84]This is a problem for 50%

    [00:36.17]of the world's population.

    [00:38.29]According to some doctors,

    [00:39.84]if these people were to chew sugar-free gum,

    [00:42.44]it would help fight this embarrassing condition

    [00:45.18]Recently, some dentists have also claimed

    [00:47.56]that sugar-free gum,

    [00:49.33]if it has green plants materials added to itm,

    [00:52.24]helps to stop tooth decay.

    [00:54.15]The say that after eating,

    [00:55.64]acid attacks one's teeth.

    [00:57.80]Chewing gum makes your mouth wetter,

    [00:59.59]which then washes away this acid.

    [01:01.94]Therefore,they say,if people were

    [01:04.02]to chew sugar-free gum after a meal,

    [01:06.22]it would help prevent tooth trouble.

    [01:07.14]

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