Results: Cola soft drink significantly reduced surface hardness of enamel, dentine, microfilled composite, and resin modified glass ionomer (p!0.05). Orange juice and sports drink significantly reduced surface hardness of enamel (p!0.05). Drinking
yogurt and Tom-yum soup did not reduce surface hardness of any substrate.
Conclusion: This in vitro study confirms the erosive potential of certain acidic food and drinks that public should be aware of.
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