A dirty oven will release bad smoke. So then not surprisingly the smoke which is being released by a dirty oven is bad for you. Because this smoke more often contains harmful gases like Sulphur dioxide, Nitrogen oxide and Carbon monoxide, can put your health in danger. A clean oven brings many benefits, the food tastes better, a clean oven retains heat much more efficiently, and heat distributed evenly. Also saving you money in the long run. When an oven is clean both inside and out, it will reach the desired temperature more quickly and use less energy. Potential Health Risks. ... Prevents fires.