If it doesn’t sound natural, cut it. If your character is a teenager from a small town in the Midwest, it’s likely that he’s not going to walk around speaking in lengthy scientific phrases. Unless it’s part of your plot (perhaps he’s River Phoenix’s character Wolfgang in The Explorers?), change or cut the dialogue.
Make sure your dialogue is easy to understand. It’s one thing to have a character with a weird accent or feature to make him interesting; it’s another to make him incomprehensible. (more…)