More teens are trying special chewing gum or a silicone device called Jawzrsize to make their jawlines look more chiseled.
Dr. Joseph Brofsky, a pediatric dentist at Cohen Children's Medical Center, told WCBS that some of the younger members of Gen Z are coming in wanting better looking jawlines.
"Older kids -- not 12 and 13 -- 16, 17 year-old kids, but usually girls, not so much boys. Girls are more interested in their jawlines," said Dr. Brofsky.
Gum from brands like Rockjaw, Jawz Gum and Stronger Gum promises to "build the most attractive jawline" and "tone and tighten 57+ facial and neck muscles, anytime, anywhere."
"Hypothetically, yes, it could increase the masseter, the chewing muscles. Okay? But it doesn't affect the growth of the jaws very much at all," Dr. Brofsky said. "So your muscles might get stronger, but there's a lot of negatives."
And those negatives weigh out any results you may see from chewing special gum.
"Tooth decay. If the gum, some of the gums have sugar in them, sucrose, and it can cause cavities. Irritable bowel syndrome, IBS, which swallowing air for people that keep chewing and chewing. And the worst problem is probably TMJ, you know, overuse of the muscles. If you chew something really hard, it can aggravate the temporal mandibular jaw muscles. And that could be a big, big problem," said Dr. Brofsky.
A silicone device called Jawzrsize is also becoming popular among teens. You put it between your top and bottom teeth and repeatedly bite down and release -- kind of like a stress ball for your mouth. But Dr. Brofsky said this is unlikely to improve your jawline -- no matter how often you use it.
"My sister broke her jaw many years ago and she used that because she couldn't open her mouth and it helped open her mouth. It's like a reverse vice where you squeeze it and it opens the mouth," he said. "But I wouldn't recommend it for, it's not going to improve your jawline."
Dr. Brofsky said at the end of the day, many of these products can end up doing more harm than good.