Difference 1: Formation
Milk is a liquid produced by mammals, primarily for nourishing their young. It is secreted by mammary glands and contains essential nutrients like fats, proteins, vitamins, and minerals.
Permanent teeth, on the other hand, are hard structures formed in the jawbone that emerge as children grow. They develop beneath the gums and replace the primary teeth (milk teeth).
Difference 2: Composition
Milk is composed mainly of water (about 87%), along with lactose (sugar), fats, proteins (like casein), and various vitamins and minerals. It is designed to provide balanced nutrition for infants.
Permanent teeth consist primarily of a hard substance called enamel, which is the outer layer, and dentin, which forms the bulk of the tooth. They also have a pulp chamber containing nerves and blood vessels, making them less flexible compared to milk.
Difference 3: Lifespan
Milk has a short lifespan; it typically lasts a few days to a week when refrigerated, and its nutritional value diminishes over time.
In contrast, permanent teeth are designed to last a lifetime. With proper care, such as regular brushing and dental check-ups, they can remain strong and functional for many years, often into old age.
In summary, while milk and permanent teeth serve crucial roles in growth and health, they differ fundamentally in their formation, composition, and lifespan. Understanding these differences highlights the importance of both in human development.