This paper reports the first attempt to use L-band spectroscopy for estimating the sensitivity of whole teeth to fast neutrons and gamma-rays. Three teeth were successively irradiated first with fast neutrons with a wide energy spectrum (mean energy around 30MeV) up to ~160Gy and then with gamma-rays up to ~14Gy. After each irradiation, L-band (~1GHz) EPR spectra of each whole tooth surrounded by the surface-coil resonator were recorded, yielding a single composite line principally due to CO 2 - and native radicals. The sensitivities are estimated by the slopes of the linear dose response curves of the dosimetric CO 2 - radicals. The ratios of the gamma/neutron sensitivities were found to be in the range 8-9 (+/-2) for the three teeth.