You've probably heard the claim that it takes more muscles to frown than to smile. It's usually framed as a feel-good reason ...

changing the local anatomy of the corners of the mouth, which may prevent the pooling of moisture and saliva in those areas.” In either case, be sure to get the buy-in of your doctor before you ...

As you lick the corners of your mouth to soothe the irritation or try ... “Any kind of appliance you have in your mouth—braces, retainers, or anything else that change the anatomy of your mouth—can ...

The measurements revealed several age-related differences in the anatomy of the upper lip ... running from the base of the nose to the corners of the lips. The findings suggest that age-related ...