It seems like common sense to brush your teeth after you eat, but some dentists actually brushing before you eat to be more effective. Brushing your teeth after eating makes sense, because you need to remove the gunk and bacteria sitting on your teeth. But if you are having sugary/acidic foods or drinks, brushing before is actually an advantage because the acid can weaken enamel and brushing immediately after can cause damage to your teeth. You can also wait and brush 30 minutes after you’ve eaten. Read more from the Mayo Clinic and dentists here: http://lifehacker.com/5991833/brush-your-teeth-before-breakfast-or-30-minutes-after-for-stronger-healthier-teeth.