My master bathroom got finished being remodeled about 2 months ago. There was no drastic plumbing work during the remodel and no pipes were moved. There was no smell up until they took the toilet off to tile underneath. They replaced the flange due to the difference in flooring thickness. A few days after they finished up the smell remained in the bathroom and adjoining master bedroom. I checked the two sinks and there was water in the P-traps. I checked the shower drain and there was water in that trap. I closed the drain and put a towel in the overflow of the tub. None of these changed the smell. The only thing that helped was turning the fan on in the water closet and closing the door. Assuming there was something wrong with the wax ring, we pulled the toilet up and sure enough there wasn't a perfect seal. We put extra wax down and put the toilet back down. However, the smell remains after we are sure there is a good seal. Where could the smell be coming from in the water closet if it isn't coming from the toilet? There are no vent pipes in the walls there so no nails in the pipes. The toilet is the same as before the remodel started and no cracks. We are on a slab. Please help!!