Losing a tooth is nothing to smile about, and replacing lost teeth with dentures or ill-fitting partials can make you keep your mouth shut. Dental implants, however, can actually bridge the gap in a very natural, comfortable way. But some factors make them worthy of a grimace more than a grin -- these things don't come easy. Know why? Take the test.
How much do you know about how car engines work? And how much do you know about how the English language works? And what about how guns work? How much do you know? Lucky for you, HowStuffWorks is about more than providing great answers about how the world works. We are also here to bring joy to your day with fun quizzes, compelling photography and fascinating listicles. Some of our content is about how stuff works. Some is about how much you know about how stuff works. And some is just for fun! Because, well, did you know that having fun is an important part of how your brain works? Well, it is! So keep reading!