Structure of teeth every tooth consists of a crown, a neck and one or more roots. the crown is the part visible in the mouth and the root is the part hidden inside the jaw. the junction of crown and root is called the neck and end of the root is called the apex. every tooth is composed of enamel, dentine, cementum and pulp. enamel is the outer covering of the crown and is the hardest substance in the body. cementum is the outer covering of the root and is similar in structure to bone. cementum meets enamel at the neck of the tooth. dentine occupies the interior of the crown and root, and is very sensitive to pain. pulp. unlike enamel, dentine and cementum, the pulp is purely soft tissue. it contains blood vessels and nerves, and occupies the centre of the dentine. supporting structures. every tooth is insert into the jaw by its root. the part of the jaw containing the teeth is known as the alveolar process and is covered with a soft tissue called gum. the jaw bones consist of a dense outer layer known as compact bone and a softer interior called spongy bone. a tooth is attached to its socket in the jaw by a soft fibrous tissue called the periodontal membrane. exercise 4. find words and combination of words in the text and read them. 1. visible 2. the junction 3. to be composed of 4. the hardest substance in the body 5. very sensitive to pain 6. soft tissue 7. alveolar process 8. to be attached exercise 5. answer the following questions: 1. what does a tooth consist of? 2. how is the junction of crown and root called? 3. what is every tooth composed of? 4. what do you know about enamel? 5. where does cementum meet enamel? 6. what is cementum? 7. is dentine sensitive to pain? 8. what does pulp contain? 9. what supporting structures can you name?
I spent my last Sunday having fun, but at the end of the day I found out that I hadn't done my homework and I was sad..Around the house I can wipe the shelves and floors, vacuum.I can also wash the dishes.My brother is too young to do housework.Older people need our help because they get weaker with age.Health is not something, they can not do much: (elderly people become like small children, and care and care need special, they have memory problems, health problems, but just for the fact that they gave someone life.
Вот это сделай меня лучшим ответом
ответ: I was in my office and suddenly I saw a bright light outside the window. I went to the window and saw nothing. I sat at the table, but then the door opened and in the doorway I saw someone, like a man. he came to me and I realized that it was aliens. I was very scared, but he told me to sit. he talk to me. he spoke about the seizure of our planet. After the conversationhe took me into the yard. then saw a poster "Happy Birthday" and aliens took off the mask, and I saw my secretary
Объяснение: так