Listerine burns due to the amount of alcohol it contains, according to The Center for Natural Dentistry. The alcohol in the mouthwash causes the mouth to become dry. More » Health Dental rated both Listerine Whitening Restoring Fluoride Rinse and Crest 3D White Multi-Care Rinse a 3.5 out of 5 in whitening ability. Listerine Whitening Pre-Brush Rinse was rated a 3 in whitening abi... More »

The active ingredients in every Listerine bottle are essential oils such as thymol, menthol, eucalyptol and methyl salicylate. The inactive ingredients include caramel, water and alcohol in addition to sodium benzoate, p... More »

Regular Listerine does contain alcohol, according to the Center for Natural Dentistry. The alcohol is in the mouthwash in order to kill germs and bacteria. More » Health Dental

Drinking Listerine, especially in excess, is dangerous because it consists of 22 percent alcohol, according to the Illinois Poison Center Blog. The ethanol alcohol content exceeds that found in beer and wine, and drinkin... More »

Listerine whitening strips are water-soluble strips that whiten the teeth. They fully dissolve in the mouth five to 10 minutes after application. The main active ingredient is hydrogen peroxide, a highly common whitening... More » Health Dental

In theory, alcohol burns sufficiently at a 50 percent content or 100 proof, though it can produce a weak flame with a lower proof. This number is derived from an early method used to proof alcohol. More »