The aim of the work was to investigate the active creep of the human mandible. Compact part of human mandibular bone under constant compression load was investigated. Due to the specific structure of the jaw bone the time dependence of the mechanical properties also forms an important stage of the quantification process. Samples for experiments were prepared from five 49 – 56 years old male lower jaws obtained in autopsy. From long term compression test of the mandible samples the creep deformations were calculated. The experimental creep deformations of human mandible compact bone material were approximated with exponential function for each sample separately and for group of samples. After estimation of obtained results and repeated approximation of samples group by two and three exponents, good results for 5 specimens were achieved. Results of this work can be used for development of the mathematical model of the human mandible.