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109 foods or mouth rinsing is not that of a satisfactory alternative to brush‑ ing; but an additional measure at the end of a meal, or a substitute when brushing is not possible. Vocabulary to the text: whereas – поскольку, несмотря ни на что detergent water – очищенная (кипяченая) вода celery – сельдерей by virtue – посредством, благодаря scour – чистить, прочищать plain water mouth rinse – обыкновенная жидкость для полоскания рта food debris – остатки пищи keeping the teeth free of food debris – содержание зубов чистими от остатков пищи the only way – единственный путь When properly done – Когда оно правильно осуществлено 2. Quote the sentences in which these words and word combinations are used in the text. Dental disorder, food stagnation, patients’ responsibility, realize, plaque formation, brushing, consistency, occasion, to remove plaque, alternative. 3. Remember the facts: • The food of modern people is soft and acid to evoke the «natural» agencies of protection and it would seem reasonable to add some «artifcial» means to remove debris from the teeth. • The brush must be a small one (3,5–4 cm); the bristles should be neither too hard nor too soft, and should be of unequal length. • Only about two teeth can be brushed at the same time. 4. Read the passage filling in the missing active words: acid, salivary, saliva, fluoride, tooth, teeth One of the most important functions of … lies in its ability to neutral‑ ize … and maintain an alkaline environment in the mouth for much of the time. This is due to the presence of calcium and phosphate in the … secre‑ tion. This reservoir of calcium and phosphate also serves to reduce to some extent the demineralization of the … during acid attack and to remineralise them when the normal pH at the … surface is restored. This remineralization process is greatly facilitated by the presence of … ions.