Tooth decay begins when acids in the mouth start dissolving the tiny enamel crystals that make up the outer surface of the tooth. Enamel is built from tightly packed mineral crystals that create a strong protective shield. When bacteria on the tooth surface break down sugars, they produce acids that lower the pH around the enamel. The acidic environment pulls essential minerals like calcium and phosphate out of the crystals. This causes the surface to become slightly softer even though it still

This experiment is designed to show the effects of different liquids on teeth. We used eggs because similar to teeth, eggshells contain calcium compounds. We prepared 4 glasses with 4 different liquids: cherry juice drink, vinegar, coffee and blackcurrant juice drink. We dropped four eggs into each glass and left them there for 24 hours to conduct the experiment. All drinks did not visibly damage eggs but coloured them into different colours. Later we tried to clean them using toothpaste, but yo