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Oxygen

Oxygen is a chemical element with symbol O and atomic number 8. It is a member of the chalcogen group on the periodic table and is a highly reactive nonmetallic element and oxidizing agent that readil ...

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Definition

Tooth brushing

Tooth brushing is a form of hygiene, in which a person cleans their teeth with a toothbrush.Modern medical research has shown that brushing teeth properly can prevent cavities, and periodontal, or gum ...