A plastic, hardening material that fills the defect formed in the tooth, the cavity in order to restore the anatomical and functional integrity of the tooth.
Seals are cement, metal, plastic, etc. The choice is made depending on the indications. So, for filling the frontal teeth, cement or plastic are used, since this material is more similar to the color of the tooth enamel.
Metal - more resistant to mechanical factors when chewing food, but are not cosmetically suitable for anterior teeth (in color). A very strong and durable amalgam filling, unfortunately, stains the entire tooth in a dark color. Seals from composites are the most promising at the present time.