What is the first step in preparation for bonding brackets to teeth?

The correct initial step when preparing for bonding brackets to teeth is to polish using a fluoride-free paste. This step is essential because effective bonding requires a clean, dry surface. Polishing the teeth removes any plaque, debris, or biofilm present on the enamel, allowing for optimal adhesion of the bonding material. By using a fluoride-free paste, you also prevent any potential interference with the bonding agent, as fluoride can negatively affect the bonding process.

Following this step ensures that the enamel surface is pristine, which is crucial for achieving a strong bond when the brackets are later placed and the bonding agent is applied. This foundational step sets the stage for successful orthodontic treatment.