17(i). What is plaque?
17(ii). Name the hardest substance in the human body
17(iii). Name the enzyme present in saliva.
17(iv). Name the gland which secretes saliva.
17(v). How can we reduce the formation of plaque from teeth?
Answers
Answer:
17(i)A sticky film that coats teeth and contains bacteria.
If dental plaque isn't removed when it's soft, it hardens and becomes difficult to remove. Dental plaque can damage a tooth and lead to tooth decay or tooth loss.
17(ii).Tooth enamel is the hardest substance in the body. The shiny, white enamel that covers your teeth is even stronger than bone. This resilient surface is 96 percent mineral, the highest percentage of any tissue in your body – making it durable and damage-resistant.
17(iii) Saliva contains the enzyme amylase, also called ptyalin, which is capable of breaking down starch into simpler sugars such as maltose and dextrin that can be further broken down in the small intestine.
17(iv).The major salivary glands are the largest and most important salivary glands. They produce most of the saliva in your mouth. There are three pairs of major salivary glands: the parotid glands, the submandibular glands, and the sublingual glands.
17(v)Floss daily: Floss once a day with dental floss or a water flosser to get rid of food and plaque stuck between teeth. ..
Brush twice a day: Brush teeth for two minutes with a soft-bristled toothbrush (manual or powered) and fluoride toothpaste.
Explanation:
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Answer:
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Explanation:
17.(i) A sticky firm that coats teeth and contains bacteria.
If dental plaque isn't removed when it's soft, it hardens and becomes difficult to remove. Dental plaque can damage a tooth and lead to tooth decay or tooth loss.
17.(ii) Tooth enamel is the hardest substance in the body.
This resilient surface is 96 percent mineral, the highest percentage of any tissue in your body – making it durable and damage-resistant.
17.(iii) Saliva contains the enzyme amylase, also called ptyalin, which is capable of breaking down starch into simpler sugars
.
17.(iv) The major salivary glands are the largest and most important salivary glands. They produce most of the saliva in your mouth.
17.(v) Prevention for plaque :-
1. To prevent plaque buildup, brush your teeth at least twice a day with a soft, rounded-tip bristled toothbrush.
2.Floss between teeth at least once a day to remove food particles and bacteria.
3.Use an antibacterial mouth rinse to reduce bacteria that cause plaque and gum disease.
Hope it helps you.