Задание

Steve is a famous dentist who is writing about the composition of hygienic toothpaste. Read the text and put the parts of the sentences below into the gaps.

Write one letter in each gap.

Hygienic toothpaste should have two main properties: cleaning the breath. At the same time, a number of requirements are imposed on it.

1. High-quality removal of daily plaque. For this, finely dispersed abrasive substances are used: silicon dioxide and calcium carbonate. They do an excellent job of cleaning the soft plaque that forms on the surface of the teeth during the day and against decay. Efficiency is assessed by the abrasiveness index. It should be between 25 and 100 units, depending on the sensitivity of the enamel.

2. No formula. For the decomposition of sugars, substances contained in the enamel are used. This leads to wear and tear and tooth decay. The main sugar substitute in the paste formula is xylitol. It reduces the number of microorganisms that can lead to tooth decay. It can save your teeth and roots.

3. Nice aftertaste. This indirectly cleaning. Products with fragrances are more pleasant to use, so people spend longer and more thoroughly performing oral hygiene. Substances included in the formulation can be divided and natural. The first can significantly reduce the cost. The latter do not harm human health. They are most often represented by essential oils: limonene, menthol, carvacrol, thymol.

A. into synthetic

B. affects the quality of

C. sugar in the

D. enamel and freshening the

E. protects your permanent teeth