Has teeth. The octopus is a creature that lives in the ocean. Researchers have found that octopuses have teeth, but not in the usual sense of the word, because octopus teeth are different from those of humans and many other animals. The researchers found that their mouths are located on the underside of their heads, above their tentacles, and in the middle of their tentacles, like the center stamen of a flower petal. In other words, the mouth of the octopus is located at the junction of its head and the topmost part of its tentacles. When observing octopuses up close, we can actually observe their mouths relatively easily.