What happens when the vent holes under the rim of the toilet get clogged?

When the vent holes under the rim of the toilet get clogged, it can lead to inadequate flushing and poor waste removal. This blockage can prevent water from flowing evenly around the bowl, resulting in incomplete flushes, increased clogs, and potential overflow issues. Additionally, it may cause unpleasant odors as waste doesn't wash away properly. Regular cleaning and maintenance of these vent holes can help prevent such problems.