It depends on your body weight and muscle mass. The general rule is Dr=L(w/ms)*100.

Where:

Dr = Drunkness (measured in square feet of alcohol per liver ounce)

L = listerine (measured in gallons)

w = body weight

ms = muscle mass

For the average twelve year old boy it should take 6.25 gallons of listerine to reach relative intoxication. You may want to consider something a little more nutritious, like huffing paint or over indulging on cold pills. Best of luck to you.