In some embodiments, the present disclosure relates to a microelectromechanical system (MEMS) comb actuator including a comb structure. The comb structure includes a support layer having a first material and a plurality of protrusions extending away from a first surface of the support layer in a first direction. The plurality of protrusions are also made of the first material. The plurality of protrusions are separated along a second direction parallel to the first surface of the support layer. The MEMS comb actuator may further include a dielectric liner structure that continuously and completely covers the first surface of the support layer and outer surfaces of the plurality of protrusions. The dielectric liner structure includes a connective portion that continuously connects topmost surfaces of at least two of the plurality of protrusions.