There are many who say that the smartest man to have ever lived was Albert Einstein. He is certainly one of the most famous of the great thinkers and his intellect contributed massively to the advancement of science.
A partial is a dental prosthetic (artificial tooth or teeth) that can be removed from the mouth somewhat like an orthodontic retainer. A bridge, on the other hand, is a dental prosthetic that's permanently anchored inside the mouth. Partials are sometimes referred to as RPDs (removable partial dentures). They're often selected as an inexpensive option over a bridge or dental implant for replacing lost teeth. Most partials work in a similar way: Artificial teeth are placed on a molded base to which metal clasps are added.
Teeth are prone to decay known as cavities. A filling is typically a two-part process (usually done in one office visit) in which the dentist removes the decay then fills the remaining tooth with a protective material. Dentists' fees are based on the type of filling material used and the number of surfaces needing a filling in a single tooth.