Definition of common for Students. 1  1 : affecting, belonging to, needed by, or used by everybody for the common good a common room. 2  2 : shared by two or more individuals or by the members of a family or group a common ancestor. 3  3 : 1general 1 common knowledge. 4  4 : occurring, appearing, or used frequently a common sight a common name.
1 Apple cider vinegar is highly acidic. 2  The main ingredient is acetic acid, which is quite harsh. 3  You should always dilute it with water or juice before swallowing. 4  Pure, straight apple cider vinegar could damage your tooth enamel or the tissues of your mouth and throat. Apple cider vinegar is highly acidic. 2  The main ingredient is acetic acid, which is quite harsh. 3  You should always dilute it with water or juice before swallowing. 4  Pure, straight apple cider vinegar could damage your tooth enamel or the tissues of your mouth and throat.
What makes apple cider vinegar such a bad whitening strategy is that it can actually be effective, partly for the same reason that itâs damaging. Apple cider vinegar is a strong acid, with a pH of about 2.4, about the same as Coke.If you put this strong acid on your teeth, it can remove some of the organic stain molecules that are trapped in your enamelâalong with the enamel.hat makes apple cider vinegar such a bad whitening strategy is that it can actually be effective, partly for the same reason that itâs damaging. Apple cider vinegar is a strong acid, with a pH of about 2.4, about the same as Coke.