Dental unit (1) comprising a water circuit (13) supplying potable water from entry point (12) to instruments (14) supported by instrument table (4), comprising an anti-stagnation system characterized in that said anti-stagnation system comprises a valve (16) placed along the water circuit (13) supplying instruments (14) on instrument table (4) said valve being open or closed, according to an automatic program (30) and/or a manual control (31) when open, it directs water from circuit (13) to an anti-stagnation discharge line (17a or 17b) leading to dental unit drain (18).
