Occasionally, toilets get stopped up. It could be do to foreign debris or just a result of normal use over time. As a toilet ages, it is more likely to become clogged. Sometimes older toilets get stopped up because the watetr way was made with very rough porcelain. Roughness can grab on to toilet paper, slowing down the flow of the flush. Mineral deposits also contribute to rough surfaces in the waterway. If your toilet is old, you should consider replacing it with a new one. Most newer toilets are made of a very very fine smooth porcelain in their waterway.
The first step in clearing a toilet is to try using the good old toilet plunger. If the plunger doesn’t work, try using a hand cranked auger. An auger slides along the waterway and as it turns while you crank it, it can catch and dislodge debris and obstructions. If there are other objects in the water way such as toys, toothbrushes or other obstacles that rotate with the auger, the auger won’t help. A sign this is happening is if the toilet flushes well one time and then continues to stop up.