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Dental hygiene (looking after your teeth and gums) is good for you. It keeps your teeth healthy, and it can help your brain. New research from the University of South Carolina suggests that flossing your teeth could reduce the risk of having a stroke. A stroke is like a heart attack, but it affects the brain. It happens when blood cannot get to the brain, or when a blood vessel in the brain bursts. Around 15 million people worldwide have a stroke each year. Of these, about 5 million die, and 5 million are left disabled. Researcher Dr Souvik Sen said oral diseases, such as tooth decay and gum disease, affect around 3.5 billion people. He said these diseases are the most widespread health problems.
Dr Sen and his team of researchers looked into the effects of flossing on our health. He said: "We aimed to determine which oral hygiene behavior - dental flossing, brushing or regular dentist visits - has the greatest impact on stroke prevention." The team found that flossing teeth at least once a week could lower the risk of different types of stroke by 22 per cent to 44 per cent. Dr Sen said flossing could reduce the risk of stroke "by reducing oral infections". He added that flossing was a cheap and easy way of caring for your teeth and body. He said: "Many people have said that dental care is costly. Flossing is a healthy habit that is easy, affordable and accessible."
The article says flossing helps your head and keeps your smile healthy. T / F
A stroke is similar to a heart attack for the brain. T / F
About 15 million people a year die from stroke. T / F
Tooth decay and gum disease affects 3.5 billion people. T / F
Researchers looked into the effects of health on flossing. T / F
Researchers say flossing once a day reduces the risk of stroke by 44%. T / F
The article says flossing is expensive. T / F
The article says flossing is easy and accessible. T / F
词汇：
dental hygiene：牙科保健（ noun）
tooth decay：牙龈炎（ noun）
gum disease：牙龈炎（ noun）
stroke：中风（ noun）
hemorrhagic stroke：出血中风（ noun）
dichotomous：两分法的（ adjective）
epidemiological：流行病学的（ adjective）
statistically significant：统计学上显著的（ adjective）
固定搭配：
keep (something) healthy：使某物保持健康（ verb + object）
reduce the risk of (something)：降低某事的风险（ verb + infinitive）
preventing (something) from (doing something)：使某事无法（ verb + from infinitive）
oral hygiene：口腔卫生（ noun）
regular dentist visits：定期看牙医（ verb + object）
dichotomous study：两分法研究（ adjective + noun）
epidemiological study：流行病学研究（ adjective + noun）
statistically significant results：统计学显著的结果（ adjective + noun）
主谓一致：
"Dental hygiene is good for you."
"Researcher Dr Souvik Sen said..."
从句和引导词：
"Dr Sen and his team of researchers looked into the effects of flossing on our health."
"Dr Sen said flossing could reduce the risk of stroke 'by reducing oral infections.'"
被动语态：
"It happened when blood could not get to the brain, or when a blood vessel in the brain burst."
"Oral diseases, such as tooth decay and gum disease, affect around 3.5 billion people."
复合句：
"We aimed to determine which oral hygiene behavior - dental flossing, brushing or regular dentist visits - has the greatest impact on stroke prevention."
"Dr Sen said flossing could reduce the risk of stroke 'by reducing oral infections'."
比较级和状语从句：
"flossing teeth at least once a week could lower the risk of different types of stroke by 22% to 44%."
