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Sharks migrate to and from different areas depending on the time of year. Some areas have lots of shark teeth because large numbers of sharks travel around the shores often. For example, sandbar sharks are found in large numbers off the east coast of Florida in spring when they mate. They move north at the end of summer and have their pups, so areas like Delaware Bay have a large population towards the early fall. Look up shark populated areas and select a beach to search for teeth. Sharks live in salt water only (except bull sharks who swim up into freshwater rivers that connect to the ocean). So don't go looking in your local pond. Sharks are more common in hot, humid places such as Hawaii and Florida. Although they can also be found at the poles. Many coastal regions of states near the ocean like California, Florida, Hawaii, Virginia, Carolina, and Alabama were once underwater. You can sometimes even find shark teeth fossils in these areas on dry land or in river beds since large portions of the state were submerged. Sharks were often drawn to these shallow waters to seek food. Big storms can bring in all sorts of debris from the ocean, including shark teeth. There will also be fewer visitors on the beach on days when the weather is less than ideal. Go in the morning when there are fewer people in the water. The calmer waters will make it easier to see any shark teeth. Weekdays are usually a less popular beach time, so go then if possible to avoid the crowds. You won't find a shark tooth in five minutes. Be prepared to stay at the beach for a couple of hours. Bring sunscreen and some water to stay there properly without harm. You may also want to pack a picnic lunch. People may be able to tell you about shark tooth hot-spots or places where they commonly found teeth. If you aren't from the area, a local may be able to tell you which beaches draw crowds and when, and which ones have a lot of teeth. You can improve your chances of finding teeth right away if you find someone that can point you in the right direction. Depending on what state or country you are looking for shark teeth in, you may need to get a permit before searching for fossils. In some areas, permits aren't necessary for shark teeth, but you never know what else you might find.

Summary:
Learn about shark migration patterns. Find a beach. Go after a storm. Start early. Be prepared. Ask locals to help you find the best spot. Get a permit, if necessary.