Many toilets have rim holes to assist with suction or power to push the waste out and down the line. Over time those rim holes become caked over with the minerals found in the water as well as buildup from the toilet - - no matter how much you clean it. When that happens, your toilet begins losing the power to push all the waste and toilet paper out far enough down the line and it begins to buildup in the line causing a barrier/wall and then backups begin to happen.
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