A toothbrush is disclosed, in which wing hairs are arranged in a V-shape in left and right sides with respect to the center hairs which are the center toothbrush hairs planted in forward and backward directions in a toothbrush head, and the V-shaped wing hairs of the left and right sides are arranged in a X-shape, and auxiliary hairs are arranged between the forward and backward wing hairs in part of the X-shaped toothbrush hairs. With the above arrangements, a contact surface area of each tooth is widened, and a more effective tooth brushing can be performed in three fossas (mesial fossa (mesial pit), a central fossa (central pit) and a distal fossa (distal pit)), a buccal developmental groove, a lingual developmental groove, an accessory groove, a triangular groove and a buccal groove of a buccal aspect, which correspond to a dental caries portion, an interproximal space in which a food debris might be accumulated, and a contact area peripherals of a buccal aspect in which a food debris might be impacted, so dental caries and tooth diseases (periodontitis) can be advantageously prevented, and a pain due to a temporomandibular disorder and a facial muscle fatigue might be reduced and recovered by protruding a cushion layer from an upper side of a toothbrush.