Your child should have lost all of their baby teeth by the age of 13, leaving them with a full set of permanent teeth. Not including wisdom teeth, there are 28 permanent teeth. Teenage years are a time of increasing independence and self-awareness, and with their newfound freedom, teenagers can make poor diet choices such as sports drinks, soda, and candy. Cavities are most common in teens because of a lack of cleaning and a bad diet. At this stage your child may also become more concerned about the “look” of their smile. As a result, a referral to our orthodontist, Dr Gordon may be made.