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.
Every main clause contains an independent subject and verb and can stand alone as a complete sentence. If you cram two or more of these clauses together with incorrect or missing punctuation, you hurt the logical parade of ideas. A comma splice incorrectly joins two main clauses with a comma, like this: Main Clause + , + Main Clause = . A fused sentence has two main clauses joined with no punctuation at all, like this: Main Clause + OE + Ã¸ Main = . clause