why does tooth decay occur start when the ph of mouth is below 5.5
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Bacteria in the mouth create acids after eating through the oxidation of sugar and food particles in the mouth. Tooth decay starts when the mouth's pH is below 5.5. ... Since plaque coats the teeth, saliva can not reach the tooth layer to neutralize the acid.
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Because mouth becomes acidic and this is why we have to brush our teeth regularly as the tooth paste is basic in nature and neutralises our mouth and prevents tooth decay.
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