The development of a compact two-wavelength Nd:YAG laser for dental and ENT applications is presented. The Nd:YAG resonator generates either 1.06$mu$m or 1.32$mu$m. The wavelength selection is made at the control panel. The Nd:YAG laser parameters at 1.06$mu$m are ; the maximum pulse duration of 150$mu$s, repetition rates of I-100Hz, and the maximum average power of 25W. At 1.32$mu$m, the pulse duration is the same where the repetition rates and the maximum average power are I-30Hz and lOW respectively. High voltage power supply consists of a simmer module and two identical high voltage DC converters. In order to make a complete medical laser system, an optical fiber delivery unit, foot pedal and water spray handpiece are also developed. The wavelength selection is reliable since no movement of optical or mechanical components is required. The high voltage power supply is compact, easy to be maintained and applicable for other laser systems due to its modular design.