There are several types of glass ionomer, produced by many different brands. First of all, this material can be used for fillings. It has strong anti-cariogenic properties because it releases fluoride and stimulates remineralization. The indications are limited because it has a lower mechanical strength compared to composites and amalgam fillings. That’s why this material is not as indicated in the posterior region as much as the other two. They are great for the restoration of milk teeth. Another advantage of this material is the fact that it doesn’t require a completely dry surface and it can form a great retention with the surface of teeth in the presence of saliva. This makes it the perfect material when working with kids. Cavities located in the cervical areas of teeth can be hard to restore, especially when there is a significant saliva flow. This is when the glass ionomer finds a great use. It connects to the tissues with a-ionic bond, and there is no need for etching with an acid. There is a much lower rate of post-restoration sensitivity because of the good biocompatibility. The adhesion is great, and if by any chance the filling falls it doesn’t happen as a result of bad bonding between glass ionomers and the tissues. These materials can be used for a so-called “Sandwich” technique in a combination with composites. With the advanced properties of these materials today they can also be applied in the posterior regions.