Why does the bathroom smell big after replacing the old toilet and installing the toilet again?

There is no good sealing, mainly in two parts: 1. The sealing of the inside of the toilet and the mouth of the sewer pipe needs to be installed; 2. The outer perimeter of the toilet base is not sealed.

Personally, I feel that the first possibility is greater, because you are changing clothes, and the workers are troublesome and do not clean and install the sealing ring.

There is no necessary connection to this. Unless it is not installed, the smell of the reverse below. If you don't smell before, you can basically rule out the floor drain and smell back, so it's hard to say this.

When you change the toilet, is there no glass glue around it?

You don't have a seal at the interface between the toilet bowl and the pipe.

Replacing an old toilet with a new toilet will inevitably have to open the previous drain position, which will inevitably cause a foul smell. If it is not discharged in time, it will stink for a while. The second point is that after installation, because it is the second installation, it is likely that the seal at the sewage outlet is not good enough, which will lead to the exposure of odor, and the ground sewage outlet is likely to fall off and become larger after long-term use, which will also make the seal incomplete!

It is recommended to seal the drain with a flange and apply a layer of glass glue around the toilet bowl at the same time!

Because the fouling of the original toilet was loosened when the old toilet was removed, the smell of the bathroom increased.

If you don't seal it well, the toilet bowl generally comes with a sink bend, and there will be no smell if it is sealed.

Could it be that the design of your new toilet is not good, and the water level of the backwater is too low to effectively check the odor.