Tested pH Values on a SpectrumNote: Water displayed under the red portion of the arrow indicates water that falls within an acidic pH range; water displayed.

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Tested pH Values on a SpectrumNote: Water displayed under the red portion of the arrow indicates water that falls within an acidic pH range; water displayed under the blue portion indicates water that falls within a basic pH range. Tested pH Values on a SpectrumNote: Water displayed under the red portion of the arrow indicates water that falls within an acidic pH range; water displayed under the blue portion indicates water that falls within a basic pH range. Kellie F. Wright J Dent Hyg 2015;89:6-12 ©2015 by American Dental Hygienists Association