A toilet that clogs once in a while is normal. One that clogs repeatedly usually has a specific cause behind it.
If plunging clears the clog but it comes back within days, the toilet itself often isn't the problem — something farther down the line is slowing flow enough that the toilet keeps backing up first, since it's usually the lowest fixture on the line.
Some older toilet models simply don't generate enough flush force to fully clear waste on the first try, leading to repeat clogs that aren't caused by anything blocking the line at all.
Tree roots or a damaged section of pipe can create a partial restriction that's just open enough to pass water most of the time, but catches paper and waste often enough to cause recurring clogs.
A toilet that clogs once might just be a one-time flush issue. A toilet that clogs repeatedly is telling you something about the line behind it, and a camera or main-line check can usually pinpoint the actual cause.
Dealing with a toilet that keeps clogging? Call (888) 616-9423.