Abstract: Teethers are configured with a base, a biting structure that extends distally from the base, and one or more handles that extend proximally from the base. The base has a hollow interior with both a proximal opening and a distal opening. The biting structure is also hollow and includes a proximal opening such that the biting structure has a proximally-facing concave interior. As a result of this design, a baby may use the teether by either grasping the one or more handles or by inserting his or her fingers through the base and into the concave interior of the biting structure. With the baby's fingers inserted into the concave interior of the biting structure, the baby can satisfy the desire to insert his or her fingers into the mouth while also biting on the teether.