How much mouthwash should you use? Pregnant women should also check with their obstetrician if they can continue to use their mouthwash, or if they need to switch to an alcohol-free variant. It's recommended that you don't eat or drink for 30 minutes after using magic mouthwash so that the medicine has time to produce an effect. A study of 4,000 people conducted by the University of Glasgow in Scotland found that people who used antibacterial mouthwash … Studies have shown that when it comes to mouthwash, there can be too much of a good thing. How Much is Too Much? However, if your toothpaste and mouthwash both contain fluoride, then it does not matter if you brush or use mouthwash first since your teeth will be protected by fluoride either way. Zero. But if you use too much mouthwash, you might not get the intended results. This is the same as 2/3 of one fluid ounce or about four teaspoons. Use a small measuring cup instead to ensure that it is the right amount. You should pour approximately 20 ml of mouthwash to use. Most formulations of magic mouthwash are intended to be used every four to six hours, and to be held in your mouth for one to two minutes before being either spit out or swallowed. Dentists often recommend mouthwash as part of a healthy oral hygiene routine. Dentists often require their patients to stick by the recommended amount of mouthwash. Some products recommend 20 ml. Don’t just pour it on your glass. Avoid Alcohol-Based Mouthwashes. How should I use mouthwash? Consult your dentist to pick a mouthwash that’s right for you, and be sure to ask them how often you should supplement your brushing-and-flossing routine with a swish-gargle-spit. "You don't swish for 2 minutes with a whitening mouthwash and suddenly have white teeth. You don’t need to use mouthwash. A Fluoride rinse is not necessary as part of your daily oral care routine in addition to brushing and flossing unless your dentist has told you that you are at higher risk for decay. This alone prevents gum disease and tooth decay. To eliminate dental disease you only need to remove plaque by flossing and brushing. When selecting a mouthwash, try to find alcohol-free ones. Most brands of mouthwash recommend that you use the product twice in a 24-hour period after first brushing your teeth. Mouthwash is an adjunct to prevent dentistry. In this situation, you should use mouthwash first then brush after. It depends on the product label.