People typically aren’t terribly fond of bitter tastes, which means that having one constantly present in your mouth can be quite annoying. While this sensation is certainly unpleasant, it can also be a sign of an untreated oral infection that can lead to serious consequences if allowed to progress. If it is harmful germs causing this troublesome taste, you should see your dentist as soon as possible if you notice it. Here are a few reasons why you may have a persistent bitterness in your mouth.