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.
graft, splice - A graft is one thing attached to another by insertion or implantation so it becomes part of it; a splice is the joining of two things end-to-end to make a new whole. pilot hole - A small hole drilled or hammered for the insertion of a nail or screw, or for drilling a larger hole.