A composite filling is used to repair a tooth that is affected by decay, cracks, fractures, or other causes.
Because it's tooth-colored, it can be closely matched to the color of your existing teeth, and is more aesthetically suited for use in your front teeth or the other more visible ones.
It's very durable and will last many years; however, as with most dental restorations, it may someday need to be replaced due to normal wear.
Composite fillings, along with silver amalgam fillings, are the most widely used today.