One of the reasons for the popularity of one-piece toilets is the lower maintenance. The molded shape of the toilet makes a one-piece easier to clean because there is less space for bacteria to become trapped and breed.

One-piece toilets are molded, so there is less chance of breakage between the couplings. However, if the china cracks in the tank section of the toilet, replacing the entire toilet is necessary. If the china cracks on a two-piece toilet, you can easily replace the cracked section. Replacing internal parts for either toilet is the same, and the seat can be easily removed and replaced on either type of toilet.