Cosmetic dentistry is the term used for all types of dental work that aims to improve the appearance of the gums, teeth, or bites. Therefore, it may require different dentistry specialties such as Endodontics, Orthodontics, Periodontics, or Prosthodontics. The primary focus is on aesthetic improvement though some procedures also address functional problems.
Symmetry and harmony are the basic guidelines of cosmetic dentistry. Unfortunately, most people have one or more dental problems, such as discoloration, teeth gaps, uneven gum lines, decayed or missing teeth, etc. Some cosmetic issues can lead to functional problems as well. Thus, while a patient is trying to have a more beautiful smile through cosmetic dentistry, s/he can also have a better bite and stronger teeth. 
There are different techniques for how implants are applied in cosmetic dentistry, such as implant crowns, implant-supported bridges, and implant-supported dentures. Implants are mostly used for functional reasons, but they can be used for aesthetic purposes, too. Since implants are the most effective and permanent way to replace missing teeth, patients looking for a sturdy and natural-looking smile makeover prefer dental implants. 

Crowns are metal or porcelain caps set onto problematic teeth. Though it is more of a functional treatment, cosmetic dentistry can make use of crowns to create better smiles. Once the crowns are attached, patients can use them for about 20 years. The average lifespan of a crown is mostly dependent on the oral care given by the patients.