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X. Answer the following questions.

1. What is mouth breathing?

2. How can mouth breathers be classified?

3. What can mouth breathing be caused by?

4. What can mouth breathing result in?

5. What is the relationship between mouth breathing and malocclusion?

6. What are the effects of thumb-sucking?

XI. Make up questions to the underlined words.

1. Mouth breathing is very harmful.

2. Many people breathe through the mouth because of the obstruction in the nasal passages.

3. Mouth breathing can disturb the usual oral physiology.

4. There is a considerable difference in opinion concerning the effect of thumb-sucking.

5. It is generally accepted that the child must break the habit of thumb-sucking.

6. Parents of the child must understand the ill-effects of thumb-sucking.

XII. Fill in the gaps with the prepositions and adverbs where required.

People who breathe … the mouth can be classified … three categories: those who do it … obstructions … the nasal passages, those who do it … habit, and those who cannot maintain closure … the lips … their anatomic structure. Mouth breathing can disturb the oral physiology and may result … gingivitis.

There are different opinions concerning the effect thumb-sucking …the physiology … the mouth. Scientists made a careful study … 60 children … birth … 14 years … age, and 20 … them were thumb-suckers. The child must break the habit … thumb-sucking … the help … the parents.

XIII. Translate the following word combinations:

дыхание через рот, распространенное состояние, носовые проходы, смыкание губ, привести к гингивиту, чисто по привычке. разница во мнении, затруднять, чувствительность к инфекции, влияние сосания большого пальца, искривленная носовая перегородка, незначительное смещение, выше понимания, бросить привычку

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