We will provide to the chewing gum group subjects with enough servings of Wrigley's extra sugar-free chewing gum (with some extra pieces as backup). The chewing gum used is Mentos 3D which contains both sorbitol and xylitol (non-hard coated type used). The mouth wash used for both groups is Plax SensitiveTM fluoride containing mouthwash which is alcohol free and causes significantly less burning sensations than regular mint mouthwashes. The mouthwash will be supplied to the subjects in unlabeled containers so as to work as a placebo. The subjects will not be told that this is a regular mouthwash with no pain reducing effects. Each of the two groups' subjects are ignorant to what the other group is receiving and whether they are in a control group or not.