Question

Saliva cannot reach the tooth surfaces to neutralises the acid as dash covers the teeth. 
give the answer before 9:15​

Answer 1

Answer:

Saliva in a healthy mouth is about pH 7.4. However, some carbonated soft drinks have a pH as low as 3.4, making them highly acidic from a biological perspective. Acids erode the surface of teeth, which are essentially composed of calcium salts that are highly vulnerable to acidic attack. Indeed, if a tooth is dropped into a glass of fizzy drink, the enamel will eventually dissolve.

Tooth erosion can also have other causes. Nearly one in 10 people for instance suffer from gastro-oesophageal reflux, when the natural acids in the stomach flow up to the mouth. These stomach acids tend to erode the back teeth more than those at the front. Frequent vomiting associated with eating disorders and even over-brushing with abrasive toothpastes can also cause surface wear and erosion of the outer enamel that protects the tooth.