There is an Ayurvedic supplement commonly used in India for its general health benefits, that has about 5% alcohol (self generated), that people swear by. It's called "Dasamoolarishtam", and is made from herbs/spices common in India. Just pronouncing it will probably improve mouth health! The alcohol is believed to be useful because it can dissolve and deliver some herbal components that are not soluble in water. You are allowed to consume only a small quantity daily. But any addictive tendencies will be strongly suppressed by its awful taste, in my experience!