Plastic surgery can either enhance a person's look or it can make them look SCARY. Personally I would never get plastic surgery (because I don't want to look like Joan Rivers, may she rest in peace), but I have nothing against it. If you just had kids and want your boobs back or if you just want bigger boobs, go for it. Just know the results aren't always good.
Here are some good, bad and just plain ugly celebrity plastic surgeries. I'll let you decide which is which.
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Having a poor self image can damage your entire life. Self esteem is one of the most important things you need to have improved to build a quality life style.
Improving your appearance with surgery because there is a serious problem with your face (medical accident, deformity or other mutations) is perfectly understandable.
However if you are adjusting yourself because you want to achieve physical "perfection" is going to get you no where. Unless your dreams specifically involve modeling or becoming a star there is no good reason to get plastic surgery.
If you want to feel better about yourself you need to find out what is really wrong on the inside. If you can improve how you feel about yourself then you will start to see a beautiful person in the mirror without surgery.