The Teeth - Free MCQ Practice Test with solutions, Class 4 Science ICSE

By the age of 3, children usually have a complete set of 20 primary teeth. These teeth, also known as baby or milk teeth, are essential for proper chewing and speech development during early childhood.

Incisors are flat teeth with sharp edges located at the front of the mouth, specifically designed for biting and cutting food into smaller pieces. This function is crucial for the initial stages of digestion, where food must be broken down before swallowing.

Molars are designed for chewing and grinding food due to their larger size and flat surfaces. They work effectively to mash food into smaller pieces, aiding in the digestive process before swallowing.

Adults typically have 32 permanent teeth, which include all four types of teeth: incisors, canines, premolars, and molars. These teeth are designed for various functions related to chewing and biting.

The visible part of a tooth is called the crown. It is the portion that is exposed above the gums and is covered by enamel, which provides protection against decay and wear.

Children have 8 molars in their primary set of teeth, with 4 in each jaw. These molars are important for chewing and grinding food during the early years of development.

Baby teeth, or primary teeth, are not a type of tooth found in adults. Adults have permanent teeth, which include molars, canines, and incisors, but not the temporary teeth they had in childhood.

Enamel is the hardest substance in the human body, covering the crown of the tooth. It protects the tooth from decay and physical wear, making it essential for maintaining dental health.

One effective method to maintain oral hygiene is to brush teeth twice daily using a soft-bristled brush and fluoride toothpaste. This practice helps remove plaque and prevents tooth decay and gum disease.

Plaque is a sticky yellow coating that forms on teeth due to the accumulation of germs and food particles. It is crucial to manage plaque because it can produce acids that damage tooth enamel, leading to cavities, tooth decay, and bad breath.

Rinsing the mouth with water or fluoride mouthwash after every meal helps to remove food particles and reduce plaque buildup. This practice contributes to better oral hygiene and helps prevent cavities.

Dentine is the hard yellow layer located under the enamel and is known to be sensitive. It plays a crucial role in the overall health of the tooth and can transmit pain signals if the enamel is compromised.

Canines are the sharp and pointed teeth located next to the incisors, designed specifically for tearing and ripping food. Their shape allows them to efficiently handle tougher foods, complementing the function of incisors and molars.

The first set of teeth that appear in children is known as deciduous teeth, also referred to as milk or baby teeth. These teeth eventually fall out to make way for permanent teeth.

The pulp is the central soft part of the tooth that contains blood vessels and nerves, supplying essential nutrients and sensations to the tooth. It plays a critical role in the health and vitality of the tooth.