Phosphoric acid etching is the gold standard method of enamel preparation before application of bonding resins for orthodontic brackets. With the recent introduction of erbium-doped yttrium aluminum garnet (Er:YAG) laser in dentistry for the ablation of hard tissues, including enamel and dentin, laser enamel preparation has been proposed as an alternative to phosphoric acid etching. Hence this study was conducted to evaluate the shear bond strength of bracket bonded to teeth etched by Acid, Er:YAG laser. The aim of the study is to “Compare the bond strengths of orthodontic bracket etched by acid, Er: YAG laser, and combined treatment on the enamel surface.” The objective of the study was to investigate methods that could obtain the maximal bond strength and to analyze the fracture mode of each method