Which is a correct characteristic of self-etch adhesives?

Self-etch adhesives are designed to simplify the bonding process in dentistry by combining the etching and bonding steps into one procedure. This characteristic means that they can simultaneously etch the dental substrate (both enamel and dentin) while also allowing for the adhesive to bond effectively. This is beneficial as it reduces the time and complexity of the procedure, making it easier for the clinician to apply the adhesive.

The option indicating separate etching steps for enamel is not applicable to self-etch adhesives, as they are designed to eliminate the need for separate acid etching. Additionally, while self-etch adhesives do contain hydrophilic components, they also incorporate hydrophobic elements, which allows for effective bonding in a variety of conditions. Lastly, self-etch adhesives are versatile and can be used in various regions of the mouth, not just limited to posterior teeth.