Depends, they could lose teeth, and gain some.
It is a vertebrate. They have backbones.
They usually replace the teeth instead of losing them. But usually the teeth are replaced every two weeks. A lemon shark replaces its teeth every 8-10 days. Young great white sharks replace there teeth every 100 days and old great white sharks replace their teeth every 230 days. The cookiecutter shark sheds the whole lower jaw at once.
12,000,345 teeth
whale sharks have 3000 little teeth but they do not use many due to their special ways of feeding
The great white sharks actually have that many teeth and they have three rows of them. This applies to all sharks that they have many rows of teeth or just many teeth.
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The exact population of cookiecutter sharks is difficult to determine due to their deep-sea habitat and wide distribution in tropical and subtropical waters. These sharks are known to be relatively abundant in certain areas, but specific population numbers are not well-documented. Their population dynamics can also be influenced by factors like prey availability and environmental conditions. Overall, while they are not considered endangered, comprehensive studies on their exact numbers are lacking.
Cookiecutter sharks (Isistius brasiliensis) are not currently classified as endangered. They are listed as "Least Concern" by the International Union for Conservation of Nature (IUCN), indicating that they are relatively stable in their populations. However, like many marine species, they could be affected by factors such as overfishing, habitat degradation, and climate change. Ongoing monitoring is necessary to ensure their long-term survival.
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Blue sharks do have teeth. Since they are carnivore's and prey on fish and other sea animals they have many teeth used to capture these hard to catch prey. Like other sharks the blue shark has many rows of teeth that fall out as they get worn down, only to be replaced by a new set of teeth.