Yeah sure Oscar fish have teeth. Cichlids in general do.

The Oscar fish is also known for its ability to bond with its owner and interact.
If you are considering breeding Oscar fish, be prepared for aggressive behavior or the death of your fish, a picky mating selection, the need for an isolated environment and a great deal of offspring when the young are hatched. Keep in mind through the process that the water temperature and pH level must be very carefully monitored both to ensure that the fish are healthy and happy and to promote the healing of any wounds that are caused by the process.
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Unfortunately, you cannot change this behavior. Oscar fish are strong and curious, and they tend to pull up rocks and plants. If you're tired of investing in living plants because your Oscar fish are destroying them, switch to plastic plants. At least you can push them back into the gravel without too much trouble. oscar fish - how to care for them n breed themImage Search Results for tiger oscar fishFeeding the Oscar Fish | Best Food for the Oscar
The Oscar fish, scientifically known as Astronotus Ocellatus or commonly known as a River Dog or Dog Fish, is one of the largest South American cichlids reaching about 12 inches long and is a fascinating fish to keep as a pet. Oscars are very docile fishes in relationship with its owner, but one must be very careful about its tank mates.In the wild, the Oscar fish eats mainly meaty foods like smaller fish, insects, or worms, but also supplement its diet with plant matter and berries that fall into the water.First of all, by being so big, the Oscar fish will need a very large tank, 125-gallons minimum for one fish or a pair. Like all fish, the water needs to be very clean, which is why you should use , as fish so large produce a lot of waste.The Oscar fish is also known as the Red, Albino and Tiger Oscar. Originating in the waters of the Amazon, the Oscar fish is another extremely popular fish. Their popularity stems from their personality, which has been compared to that of a puppy. Many keepers experience begging around meal times or the seemingly playful greetings they receive from their fish when they get home.It is fairly common for your Oscar fish to develop a strange lump or protrusion on its lower jaw. These lumps are often described as looking like pimples, warts or even zits coming to a head. As far as I'm aware this lump hasn't got a scientific name, although I did see the word "chinple" appear somewhere.I can't honestly tell you why these lumps appear. However, they do often appear when the Oscar is approaching maturity. As anyone who has Oscar Fish will tell you, Oscars absolutely love to dig around in the substrate as well as vigorously cleaning the flat rock which they often monopolise as their own. Because the surface area needs to be clean, they use their mouths to scrape any dirt or debris off the rock. I believe that this pimple develops because of this reason. I have no scientific proof to back up my claims but many of the Oscars I have had over the years have developed this protrusion in the exact position on their jaw that they use to clean their rock.The Oscar Fish will eat most flakes, pellets, frozen, freeze dried and live foods including any other fish they share a tank with that are small enough to fit in their mouths.There are a few color varieties of the Oscar Fish including albino, olive-green, brown and dark gray. They can get quite large, usually 12-14 inches and should be kept in a 75 gallon or larger aquarium. The Oscar is also known for being one of the more messy tropical fish to keep. Try to get the best filtration system possible for them and be prepared to perform frequent water changes. They are known to rearrange their environment from time to time and to bash in to filter uptake tubes and heaters. If you are wanting to keep live plants in an aquarium you may not want to get an Oscar because they love to dig up plants. They are also very good jumpers, so a heavy hood is a necessity.Apart from this disease, Oscar fishes are very hardy and rarely become ill if kept in good condition, but you should always keep an eye on them for bacterial or fungal infections, as well as parasites.