Abrasive blasters are devices designed to deliver a stream of abrasive powder such as an aluminum oxide or silica and air. The abrasion of bonding surfaces, whether intra- or extra-oral, enhances adhesive procedures by increasing micron retention. Abrasive blasters can prepare extra-oral surfaces like crowns and bridges prior to adhesive bonding procedures. Abrasive blasters can also etch endodontic posts and polish restorations and prosthetics. The intraoral employment of abrasive blasters is called air abrasion. Air abrasion can be used to remove tooth decay and stains and to prepare intra-oral surfaces prior to adhesive restorations.