If you use "Ultra Klean Saliva Mouthwash" b/f the swab test it will coat the mouth allowing of passing of the test for 30-40 min.
Oral hygiene is the practice of keeping the mouth and teeth clean to prevent dental problems, most commonly, dental cavities, gingivitis, and bad breath. There are also oral pathologic conditions in which good oral hygiene is required for healing and regeneration of the oral tissues. These conditions included gingivitis, periodontitis, and dental trauma, such as subluxation, oral cysts, and following wisdom tooth extraction.
Cotton swabs (American English) or cotton buds (British and Australian English) or ear buds (British and South-African English) consist of a small wad of cotton wrapped around one or both ends of a short rod, usually made of either wood, rolled paper, or plastic. They are commonly used in a variety of applications including first aid, cosmetics application, cleaning, and arts and crafts. The cotton swab was invented in the 1920s by Leo Gerstenzang after he attached wads of cotton to toothpicks. His product, which he named "Baby Gays", went on to become the most widely sold brand name, "Q-tips", with the Q standing for "quality". The term "Q-tips" is often used as a genericized trademark for cotton swabs in the USA. Although doctors have said for years that usage of the cotton swab for ear cleaning or scratching is not safe, such use remains the most common.