The introduction of acid etching techniques into many dental disciplines has resulted in safe, simple, conservative, and sometimes more economic methods of treatment. Further, in some instances, it has extended greater opportunities for treating such groups as those physically and emotionally handicapped in whom preventive and restorative procedures are often difficult. It is a significant departure from conventional, established techniques and may supersede some and may share with other established techniques an adjunctive relationship. By many, acid etching techniques are viewed with cautious optimism. It is deceptively simple. Strict adherence to the basic principles of application is important to its success.