Yes it is. The while idea about cosmetic dentistry is based on smile enhancement. Cosmetic dentistry is also referred to as smile enhancement.
Cosmetic dentistry is more than just oral health care, which involves treatment and maintenance of dental health, it's also a process which involves making a positive change to the teeth in order to enhance smile and general facial looks. It is also called smile enhancement because the end of the procedure can have dramatic results on your overall appearance.
Just like every other body cosmetic procedures, cosmetic dentistry is aimed at enhancing the facial smile by undergoing procedures which ranges from gaps closing, basic color corrections to replacing missing teeths.
Drawing from this, you'd agree that cosmetic dentistry is majorly aimed at improving the facial area around the mouth to give a person a better look when they smile. So yes, cosmetic dentistry can help in giving a better designed smile.