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  • A selection of oranges and Toothpaste squeezed out of tube.
    Rights: The University of Waikato Te Whare Wānanga o Waikato Published 7 April 2021 Size: 3 MB Referencing Hub media

    Citrus fruits contain citric acid1. Toothpaste is a weak base2. Toothpaste neutralises the acids3 in foods and protects tooth enamel4.

    1. acid: A hydrogen-containing substance that is capable of donating a hydrogen ion to another substance.
    2. base: In genetics: DNA is made up of four bases: adenine (A), cytosine (C), guanine (G) and thymine (T). In RNA, the base uracil (U) replaces thymine. In chemistry: A molecule that takes up or accepts protons. A compound that reacts with an acid to form a salt.
    3. acid: A hydrogen-containing substance that is capable of donating a hydrogen ion to another substance.
    4. tooth enamel: The hardest and most highly mineralised substance of the body. A form of hydroxyapatite is the main mineral present.
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      acid

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    2. A hydrogen-containing substance that is capable of donating a hydrogen ion to another substance.

      base

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    4. In genetics: DNA is made up of four bases: adenine (A), cytosine (C), guanine (G) and thymine (T). In RNA, the base uracil (U) replaces thymine.

      In chemistry: A molecule that takes up or accepts protons. A compound that reacts with an acid to form a salt.

      tooth enamel

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    6. The hardest and most highly mineralised substance of the body. A form of hydroxyapatite is the main mineral present.