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They will replace teeth that are broken and young sharks can even replace their teeth weekly. [3] Although sharks constantly shed their teeth, factors such as water temperature affect the turnover rate. While warmer water temperatures produced faster rates, cold water temperatures slowed tooth replacement rates in nurse sharks. [4]
Shark teeth are strong and made of enamel. Many sharks have 3 rows of teeth. These teeth are embedded in the gums, not the jaw. [10] Sharks are born with teeth that are constantly being replaced. Teeth are replaced every two weeks, approximately. [10] The shape of the teeth determine the diet of the shark.
Its teeth are highly differentiated between the upper and lower jaws, with the upper teeth small and narrow and the lower teeth large, triangular, and serrated. Its typical length is 1.0–1.4 m (3.3–4.6 ft), though examples as long as 5.9 ft (180 cm) have been encountered.
The teeth of carnivorous sharks are not attached to the jaw, but embedded in their flesh. In many species, teeth are constantly replaced throughout the shark's life. Even though the basking shark is considered to be slow and very large, it can actually breach the water, i.e. jump fully out, as some whales do.
The 48 to 52 teeth of the upper jaw are very thin and pointed, lacking serrations. These upper jaw teeth act as an anchor while the lower jaw proceeds to cut massive chunks out of the prey. The 48 to 52 lower teeth are interlocking, broad and square in shape, containing short, smooth cusps that point outward. [12]
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One of the few sharks to exhibit parental care, female horn sharks in the wild pick up their eggs in their mouths and wedge them into crevices. [3] However, in captivity the eggs are simply dropped on the bottom and may later be cannibalized. [2] The eggs hatch in 6–10 months; at emergence the young measure 15–17 cm (5.9–6.7 in) long. [1]
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