Chemistry · Acids, Bases and Salts
दांतों का सड़ना (दंत क्षय) आमतौर पर तब शुरू होता है जब मुंह का pH मान होता है:
- 17.5 से अधिक
- 25.5 से 7.5 के बीच
- 35.5 से अधिक
- 45.5 से कम✓
सही उत्तर देखें
5.5 से कम
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