A tooth abscess differs from a gum abscess by the source of the original infection. The tooth abscess (or periapical abscess) originates from the pulp of the tooth and exits out the tooth's apex at the bottom of the root. A gum abscess (or periodontal abscess) starts in a gum pocket outside of the tooth next to the root.
Click here to see a 239-word sentence that is a perfectly fine sentence (structurally). When two independent clauses are connected by only a comma, they constitute a run-on sentence that is called a comma-splice. The example just above (about the sunscreen) is a comma-splice.
As you can see in these two sentences, comma splices and run-on sentences are similar. mistakes. In both cases, the punctuation (or lack of it) does not indicate complete, independent sentences. A comma splice or run-on sentence can also occur when you use transition words: NO: The U.S. Postal Service is usually very reliable, however, sometimes a letter. is not delivered for weeks, months, or even years.