Pain is not the most common sign that you'll need a tooth filling. This post will help you understand why it's important to detect a dental cavity and treat it at an early stage. Dental cavity or tooth decay can be on tooth surface that is visible to the eye or hidden between our teeth. Cavities start small and are usually painless. The visible ones appear as dark spots on the top or outside surface of teeth. These spots are not necessarily cavities; they can be stains. Call