TLDR
Some popular drinks like cola and orange juice can damage teeth by making them weaker, but drinks with fluoride, like tea, can help protect teeth from this damage.
Summary
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1 Study Aim
The main goal of this study was to systematically examine how different commonly consumed beverages affect the surface of dental enamel (the hard outer layer of teeth). The researchers wanted to measure changes in enamel hardness and the loss of important minerals, specifically calcium and phosphate ions, after exposing teeth to these drinks. They also aimed to see how the acidity (pH) and fluoride content of each beverage influenced its potential to cause tooth erosion. The study set out to find out which drinks are most likely to harm teeth and why.
2 Study Design
The researchers conducted an in vitro (laboratory-based) experiment using 49 healthy second premolar teeth that had been extracted for reasons unrelated to decay. These teeth were cleaned and divided randomly into seven groups, each exposed to a different beverage: distilled water, mineral water, instant coffee, black tea, Pepsi-Cola, orange juice, or synthetic vinegar. The team used a modified Nordini Artificial Model (mNAM) to mimic the conditions of the human mouth. Each tooth was exposed to its assigned beverage for 10 minutes at body temperature. The enamel surfaces were examined before and after exposure using a Scanning Electron Microscope (SEM) for surface details and Energy-Dispersive X-ray Spectroscopy (EDS) for measuring mineral content. Surface hardness was tested with the Knoop Hardness Scale. Statistical analysis was performed using the Wilcoxon signed-rank test, with adjustments for multiple comparisons. The study tested how different drinks affect tooth surfaces in a lab setting using real teeth and special imaging tools.
3 Findings
The study reveals that distilled and mineral water did not cause any significant changes to tooth enamel. Coffee led to a moderate loss of calcium and phosphate (about 8–9%), suggesting some risk of erosion. Black tea, which contains fluoride, showed signs of helping to rebuild enamel rather than causing damage. Pepsi-Cola and orange juice, both acidic and low in fluoride, caused the most harm, with Pepsi-Cola leading to a 24% loss of calcium and orange juice causing a 17% loss. Vinegar also had a strong erosive effect, with a 17% loss of both minerals. The researchers found that drinks with low pH (high acidity) and little or no fluoride are most damaging to teeth. SEM images confirmed visible damage, such as cracks and rough surfaces, after exposure to these drinks. The study also found that measuring enamel hardness is the most reliable way to detect dental erosion. The authors recommend public health policies to reduce the consumption of highly erosive beverages and suggest that fluoride in drinks can help protect teeth. They also note that future research should use larger samples and more realistic mouth conditions to better understand long-term effects. Drinks like cola and orange juice can seriously weaken teeth, but tea and water are much safer for dental health.