Here is a shorter, highly comprehensible, and well-structured lesson note designed for Grade 5 Physical and Health Education (PHE), aligned with the Nigerian curriculum.

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PHYSICAL AND HEALTH EDUCATION

CLASS: GRADE 5

TOPIC: THE TEETH, DENTAL PROBLEMS, AND PREVENTION

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INTRODUCTION TO THE TEETH

Teeth are the hard, white structures in our mouths. We use them for chewing food, speaking clearly, and giving shape to our faces.

Humans have two sets of teeth in their lifetime:

1. Temporary Teeth (Milk Teeth): These are the first set of 20 teeth that grow during childhood and later fall out.
2. Permanent Teeth: These are the adult teeth (32 in total) that replace the milk teeth. If lost, they do not grow back.

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TYPES OF TEETH AND THEIR FUNCTIONS

There are four main types of teeth, each with a specific job:

1. Incisors: These are the four front teeth on both the upper and lower jaws. They are sharp and shaped like chisels, used for biting and cutting food.
2. Canines: These are the sharp, pointed teeth next to the incisors. We have four in total. They are used for tearing food (like meat).
3. Premolars: These are broad, flat teeth located behind the canines. They are used for crushing and grinding food.
4. Molars: These are the largest teeth at the back of the mouth. They have flat surfaces and are used for vigorous chewing and grinding of food before swallowing.

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STRUCTURE OF A TOOTH

A tooth is made up of different parts:

• The Crown: The visible white part of the tooth above the gum.
• The Root: The hidden part of the tooth anchored inside the jawbone.
• The Enamel: The outer, white cover of the tooth. It is the hardest substance in the human body.
• The Dentin: The hard layer underneath the enamel.
• The Pulp: The soft inner part containing blood vessels and nerves.

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COMMON DENTAL PROBLEMS

When we do not care for our teeth, harmful bacteria grow in our mouths, leading to dental diseases such as:

1. Tooth Decay (Cavities): Small holes in the teeth caused by bacteria feeding on sugary foods left in the mouth.
2. Halitosis (Bad Breath): A foul smell coming from the mouth due to poor dental hygiene.
3. Gingivitis (Bleeding Gums): Red, swollen, and bleeding gums caused by plaque (a sticky layer of bacteria).
4. Toothache: Sharp, painful sensations in the tooth, usually caused by deep decay.

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PREVENTION AND CARE OF THE TEETH

To keep our teeth healthy, strong, and sparkling, we must practice the following:

• Brush twice daily: Brush your teeth in the morning and at night before bedtime using a soft-bristled toothbrush.
• Use fluoride toothpaste: Fluoride helps to strengthen the enamel and prevent tooth decay.
• Reduce sugary foods: Avoid eating too many sweets, chocolates, biscuits, and soft drinks.
• Eat teeth-healthy foods: Eat foods rich in Calcium (milk, cheese, fish) and Vitamin C (oranges, vegetables) to keep teeth and gums strong.
• Do not use teeth as tools: Avoid using your teeth to crack bones or open bottle caps.
• Visit the dentist: See a dentist at least once every six months for dental check-ups.

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SUMMARY

• Teeth help us to bite, tear, crush, and chew food.
• We have four types of teeth: Incisors, Canines, Premolars, and Molars.
• Poor dental hygiene causes cavities, bad breath (halitosis), and bleeding gums.
• We can prevent dental problems by brushing twice daily with fluoride toothpaste and limiting sugary foods.

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CLASSWORK

Answer the following questions:

1. State the primary function of the Incisors and Canines.
2. Mention the two sets of teeth that humans have in their lifetime.
3. What is the hard outer layer of the tooth called?
4. Define Halitosis.
5. Mention three ways we can prevent tooth decay.