Which of the following is an INCORECT statement related to dental health?

Correct option is D

Correct Answer: (D) Toothpaste, which is generally acidic, prevents tooth decay.

Explanation:
The statement that toothpaste is generally acidic is incorrect. Most toothpastes are mildly alkaline or neutral, not acidic. Toothpaste helps prevent tooth decay by neutralizing acids in the mouth and by providing fluoride, which strengthens tooth enamel. Acidic substances can contribute to tooth decay by eroding enamel over time, so it is important for toothpaste to be pH-balanced to avoid this.

Other Options:

• Tooth enamel, made up of calcium hydroxyapatite, is the hardest substance in the body: This is correct. Tooth enamel, composed of calcium hydroxyapatite, is the hardest tissue in the human body.
• Bacteria present in the mouth produce acids by degradation of sugar and food particles remaining in the mouth after eating: This is correct. Bacteria feed on sugars and food particles in the mouth, producing acids that can lead to tooth decay.
• Tooth decay starts when the pH of the mouth is lower than 5.5: This is correct. When the pH of the mouth drops below 5.5, it creates an acidic environment that can start eroding tooth enamel, leading to decay.