Our gel works even faster than our spray when used as directed to remove plaque and tarter, also kills bacteria on contact, and as a bonus bad breath is eliminated! No toothbrush required. Peppermint flavor! PetzLife Oral care Spray & Gel are 100% natural. They have been tested by an independent lab and found to be perfectly safe for your pet's. There are no side effects and are even safe enough to use on people! The main ingredient in them is a specially formulated grapefruit seed extract. Here is the full list of ingredients: Grapefruit seed extract, Grape seed extract, Thyme oil, Neem oil, Rosemary oil, and Peppermint oil. These are all specially formulated with distilled water and grain alcohol to produce one of the most effective and safest dental products ever produced. You will notice that your pet will lick their lips repeatedly after you spray or apply gel. This natural reaction helps coat your pet's teeth and gums.