Plastic surgery

Plastic Surgery is a mechanism that allows a Sim to change their facial and/or body structure. This feature appears in The Sims 2: University and The Sims 3: Pets.

The Sims 2: University
Sims who work in Show Business career will get Dr Vu's Automated Cosmetic Surgeon, which is unlocked at level 6. This is a career reward that allows Sims to change their facial structure. When used, the face-shaping controls from the Hair and Face section of CAS will appear, enabling the player to change Sim's face. However, the interface lacks an undo button, so players cannot undo an action when choosing the face templates or changing the sliders. The effect of plastic surgery cannot be undone, but there is no limit to the number of times a Sim can use the Automated Cosmetic Surgeon. Only young adults and older can use this object.

There's a chance that the machine will malfunction and change the Sim's face in random ways, causing him or her to have a twisted, distorted face. While the Sim's face cannot be untwisted, plastic surgery can be used to give him or her a normal face.

Plastic surgery is purely cosmetic, and does not affect Sims' genetics. Thus, a child from a Sim who has used the machine will carry the Sim's original genetics.

The Sims 3
Sims can get plastic surgery from the hospital. Sims can get either face or body surgery, to change their face structure, or their weight, muscle mass, muscle definition, and breast size, respectively. There are cheap and expensive surgeries for each kind.