Combined with a Low PH Level,insoluble Materials Like Abrasives Are

question 16

Multiple Choice

Combined with a low pH level,insoluble materials like abrasives are:

• A) More harmful for tooth enamel and dentin
• B) Less harmful for tooth enamel and dentin
• C) More harmful for gingiva
• D) Less harmful for gingiva

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Definitions:

Crude Birth Rate

A demographic measure representing the number of live births in a given year per 1,000 people in the population.

Annual Number

A quantity or statistic that is reported or measured once every year.

Live Births

The number of babies born alive in a given time period and region.

Demographic Transition Theory

A concept explaining how a nation moves from having high birth and death figures to low ones as it progresses from a pre-industrial to an industrial economic system.