Are Sharks Teeth Bones: Is It- Why, How, Detailed Facts


Are Sharks Teeth Bones: Is It- Why, How, Detailed Facts

If one thing is infamous about sharks, it would be their teeth. How many times did we get goosebumps seeing a movie poster of a smirking shark? A lot of time!

Shark teeth are not made of bones but cartilage. Shark teeth, in particular, are formed of hardened tissue called dentin. Dentin is what allows shark teeth to fossilize quickly. 

Key Takeaways:

TopicKey Points
Composition of Shark Teeth– Shark teeth are not made of bones but of hardened tissue called dentin, covered by an outer layer known as “enameloid.”
– Dentin allows shark teeth to fossilize quickly, making them common fossils.
Shark’s Body Composition– Sharks are entirely cartilaginous, including their teeth and bodies.
– Shark jaws are cartilage-based, providing flexibility and the ability to open wide.
Shark Teeth Characteristics– Sharks have a variety of tooth shapes and sizes, adapted for crushing, grasping, and cutting prey.
– Teeth types vary based on the shark’s species and diet, from needle-like to flat for crushing.
Unlimited Teeth– Sharks have a continuous supply of teeth throughout their lives, as they regularly shed and regrow them.
– Some species, like the great white shark, may have as many as 20,000 teeth in their lifetime.
Multiple Rows of Teeth– Many sharks have multiple rows of teeth in their upper and lower jaws, with numbers ranging from 3 to 50 rows.
– The number of rows varies among shark species, with some having up to 50 rows of teeth.
Retractable Teeth– Shark teeth can move forward and backward in rows, with some species having teeth that rotate or retract on their own axes.
– This movement allows sharks to maintain a continuous supply of teeth.
Types of Shark Teeth– Sharks do not have canine teeth; they have distinctive tooth shapes, including dense flattened, needle-like, pointed, and non-functional teeth.
Fossilization of Shark Teeth– Shark teeth are common fossils, taking thousands of years to fossilize.
– Minerals in the surrounding sediments replace the shark teeth’s natural minerals, resulting in various colors, including black.
Comparison with Crocodiles– Sharks have a greater number of teeth than crocodiles, with some species having over 50,000 teeth in their lifetime.

Sharks are comprised entirely of cartilage, not just their teeth. Therefore, even though they possess spines, it is incorrect to assume that they are comprised of bones.

Image Count: Shark teeth by simonegmoreira from Pixabay

What is a shark’s tooth made of?

Sharks grow and regrow their teeth throughout their life, and some of them may even have 50000 teeth throughout their lifespan. 

Dentin is the material that makes up a shark’s tooth. The dentin is protected by a strong, mineralized coating on the outside. However, this outer layer lacks ectodermal enamel and is referred to as ‘enameloid.’

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The outer layer of enameloid makes shark teeth stronger despite not being comprised of bone. Enameloid is one of the hardest mineralized tissues that animals have evolved.

Is a shark’s jaw made of bone?

Image Credit: Skeleton of a shark jaw with teeth from Pxhere

The hardcore truth is that sharks’ bodies are not made of bones. Instead, their whole body is cartilaginous.

The same may be said for sharks’ jaws, as they have a cartilage-based single set of oral jaws. These fish, however, do not have pharyngeal jaws. Since their jaws are made of cartilage, they are more flexible and can be opened much wider than bone-built jaws. 

It’s worth noting that the jaws of some shark species, such as great white sharks, are directly (loosely) attached to the skull. This structure allows this species to expand their jaws wider and bite more effectively.

Do sharks have sharp teeth?

Image Credit: Shark teeth from Hippopx

Sharks’ teeth come in different shapes and sizes. Their main purpose is to crush, grasp, and cut through the prey.

Hence, sharks do have sharp teeth. Sharks are carnivorous and sharp teeth are necessary for their survival. But not all of them will have sharp, scary teeth like needles. The type of teeth predominantly depends on a shark’s type and food habit. For example, hunters’ sharks would have triangular-shaped teeth with sharp tips. 

Do sharks have unlimited teeth?

Whenever we see an image of a smiling shark, we see lots of teeth in its mouth. But do they really have unlimited teeth?

Well, sharks do have unlimited teeth and can have an endless supply of them throughout their lifespan. However, since shark teeth are made of cartilage, they fall out from time to time. And these marine predators regrow new teeth to compensate for the older ones. In fact, a great white shark can have as many as 20000 teeth in its entire lifetime. 

Sharks don’t regrow their teeth piece by piece; instead, they have numerous rows of teeth that regularly regrow within their jaw. It’s worth noting that a shark can lose nearly 30.000 teeth and renew them up to 50 times during a lifetime.

Do sharks have flat teeth?

As stated above, sharks are carnivorous and have sharp teeth. But is this the only shape they get for their teeth?

Shark teeth’ shape and size vary as per their food habits and can be flat or sharp. However, sharp teeth are not the only characteristics of sharks. Like nurse sharks and angel sharks, sharks that have flattened teeth often kill their prey by crushing them. 

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However, you will hardly find flattened teeth sharks on the water surface, as they inhabit at the bottom of the ocean from where they get much of their food. Their diet mainly includes aquatic animals like shells, shrimps, crabs, turtles, etc. 

Do sharks have multiple rows of teeth?

Although they may look vicious, shark teeth are weaker than humans. As a result, their teeth tend to shed easily, only to be replaced by new ones.

Many sharks have stacked rows of teeth. Their upper and lower jaws might contain as little as three rows or as many as fifteen. But 15 rows of teeth in each jaw can be taken as an average number. This is not, however, a generalized reality. 

We say this because a bull shark can have up to 50 rows of teeth, each of which may have seven teeth. At any given time, this amounts to around 350 teeth.

Do sharks have two rows of teeth?

We have mentioned above that sharks’ teeth are arranged in multiple rows. This is because they shed and regrow teeth in several rows at a time.

That said, some sharks can have 2- 3 rows of teeth. However, this number is considered low because on the higher side it can go up to 17. 

Do sharks have five rows of teeth?

We must not generalize the number of rows in sharks. The main fact is that they have multiple rows in both of their jaws.

Sharks can have up to five rows of teeth. This number, however, changes based on the shark’s species. In fact, most sharks have 5-15 rows of teeth.

Do sharks have retractable teeth?

Image Credit: A great white shark from Pxhere

Sharks have rows of teeth behind each other, and as one tooth falls out, it is replaced by the one from behind.

Sharks have teeth that may retract or rotate. Their teeth are unconnected to the jaw and, as a result, can move into alignment when the jaw is extended wide, which is why we call it that. It resembles the claws of a cat. 

Great white sharks, for example, have teeth that spin or retract on their own axes. They move outward and retract when the mouth is opened wide and closed. 

Do sharks have canine teeth?

Because of mammals like dogs and cats, we have a general idea that canine teeth are companions of carnivorous creatures.

Despite being one of the most ferocious predators on the planet, sharks do not have canine teeth. To cut through their prey, these aquatic creatures have sharp needle-like teeth. They do not require canines for the function of eating. Shark teeth are distinctive in shape and size, making them easy to distinguish.

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Instead, there are four types of teeth found in sharks, namely:

  • Dense flattened
  • Needle-like
  • Pointed 
  • Non-functional

Are shark teeth fossils?

Image Credit: Shark teeth fossils by Engin_Akyurt from Pixabay

Dentin is a strong, mineralized tissue that takes a long time to degrade in shark teeth.

As a result, shark teeth are among the most frequent fossils on the planet. On the other hand, a shark tooth takes a long time to become a real fossil, roughly 10,000 years (approx.). However, we are unable to determine the exact time.

Here, it should be noted that sharks’ teeth and vertebrae become fossilized and not all of their other body parts. The reason is simple: they are calcified sufficiently to become fossils. 

Do sharks have white teeth?

Sharks have many teeth, which are stacked in layers. Sharks can be described as teething machines.

The top and base of any modern-day shark teeth are usually white.

Do shark teeth turn black?

Image Credit: Black fossilized shark teeth by 2211438 from Pixabay

The minerals in the surrounding sediments are responsible for the changing hue of fossil shark teeth.

Black teeth are usually fossilized teeth. This is because the natural minerals in the shark’s teeth are replaced by minerals found in the soil or rock where the teeth are buried during fossilization. The minerals change color as they react with the oxygen, rendering the teeth black.

On the other hand, a fossilized shark tooth can be discovered in a variety of colors, including brown, grey, red, and sometimes even green.

Do sharks have more teeth than crocodiles?

Both crocodiles and sharks are dangerous predators and are known for their sharp teeth. However, it is their teeth that make them look so ferocious.

Sharks have a larger number of teeth than crocs. For example, crocodiles can have nearly 60 teeth at a given time and over 2000 teeth throughout their lives. On the other hand, a shark can have 50 to 300 teeth at any given time and over 50,000 teeth across its lifetime.


Q: Are shark teeth bones?

A: No, shark teeth are not bones. They are actually made up of a substance called calcified cartilage.

Q: Do sharks have bones?

A: Sharks do have bones, but their skeletons are made up mostly of cartilage.

Q: How are shark skeletons different from other vertebrates?

A: Unlike most other vertebrates, sharks have skeletons that are made up mostly of cartilage instead of bone.

Q: Do fossilize sharks have bones?

A: Fossilized sharks do not have bones. During the fossilization process, the cartilage of the shark’s skeleton is replaced with minerals, creating a fossilized version of the shark’s original cartilage skeleton.

Q: How many bones do sharks have?

A: Sharks don’t have as many bones as other vertebrates. Their skeletons are made up mostly of cartilage.

Q: What is shark cartilage?

A: Shark cartilage refers to the flexible connective tissue found in the skeleton of a shark. It is a strong yet lightweight material that provides support and flexibility to the shark’s body.

Q: What is shark skin made of?

A: Shark skin is made up of tiny tooth-like structures called denticles. These denticles are made of a hard, enamel-like substance and help to reduce drag as the shark moves through the water.

Q: Do sharks have a complete skeleton?

A: Sharks don’t have a single bone that makes up their skeleton. Instead, their skeleton is made up of cartilage, which is lighter than bone and allows the shark to be more buoyant in the water.

Q: Can sharks fossilize?

A: Yes, sharks can fossilize. The fossilized remains of sharks, including their teeth and cartilage, can provide valuable insights into the ancient world and the evolution of these fascinating creatures.

Q: What are some examples of shark species with fossilized remains?

A: Examples of shark species with fossilized remains include the Megalodon, a giant prehistoric shark, and the ancient shark species found in rocks dating back millions of years.


To wrap up, we can safely say that sharks’ teeth are as versatile as the animals themselves. Interestingly their teeth are not made of bones but are hard enough to tear through the skin and flesh of the prey. However, not all of them possess highly sharp teeth and flattened teeth, and small fillers, depending on their food habit. This is an exhaustible list. You can conduct your research to dig deeper into this context. 

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