maianhtrinhgiaotien 6/2/2024 10:23:44 PM

        It is common knowledge that our teeth are generally quite sensitive to pain. But wouldn’t it be better if they could just chew away under any conditions? In spite of our dental discomfort, it turns out there’s a good reason our teeth are so sensitive.

        To begin with, we should understand how our teeth can hurt. A normal tooth has three layers, and only the innermost layer, called the pulp, can feel pain. This is because it contains a large number of nerves that scientists call afferent sensory fibres, and they only respond to one sensation: pain. So, whereas people with tooth sensitivity may complain of tooth pain triggered by heat or cold, the nerves in the pulp don’t actually sense temperature, but instead only feel pain.

        So, what’s the point? Whenever a tooth is being damaged, pain acts as a signal that we can easily perceive, which urges us to avoid making things worse, said Julius Manz, spokesperson for the American Dental Association. “If you eat something too hot or chew something too cold, or if the tooth is worn down to the point where the underlying tissue underneath is exposed, all of those things cause pain, and then the pain tells the person that they should not use that tooth or do something to try to protect it a little bit more. So, it’s really a protective mechanism more than anything,” Manz explained.

        If teeth didn’t feel pain, we might continue to use them in situations that damage them so much that they break or have to be removed completely, Manz saiD. And for humans, this can be a big problem because, unlike sharks and alligators, we can’t replace them when they are broken.

(Adapted from livescience.com)

Question 6: What is the passage mainly about?

                A. What happens when our teeth feel no pain           B. The three layers of the human tooth

                C. The way human teeth respond to pain          D. Why our teeth should feel pain

Question 7: The word “they” in paragraph 3 refers to ___________.

                A. teeth            B. nerves           C. scientists        D. people

Question 8: Which of the following is NOT mentioned in paragraph 3?

                A. Teeth pain is a way for the body to tell you to prevent them from any further damage.

                B. Our teeth feel the most pain when their underlying tissue becomes exposed.

                C. Eating something that is too cold is one of the things that causes tooth pain.

                D. Pain in a tooth is a mechanism that helps people realise they should protect it better.

Question 9: The word “perceive” in paragraph 3 is closest in meaning to __________.  

                A. capture         B. observe         C. reveal        D. notice  

Question 10: Which of the following is TRUE, according to the passage?

                A. In a normal human tooth, layers other than the pulp do not respond to pain.

                B. Afferent sensory fibres is the scientific name of nerves lying in a tooth’s layers.

                C. The tissue underneath your teeth is most often exposed when you eat hot things.

                D. If our teeth did not hurt, most of us would do things that heavily damage it. 

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