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.
Using just a comma without the FANBOYS results in a comma splice--and fails to specify the intended relationship. Leaving out the comma and using just the FANBOYS results in a run-on sentence. Using just a comma without the FANBOYS results in a comma splice--and fails to specify the intended relationship. Email this exercise to your Instructor: Please make sure to include your name.