The ancient Greek philosopher and scientist Aristotle once said, "Personal beauty is a greater recommendation than any letter of reference." His wise words have stood the test of time.

Nowadays, more people prefer to go under the knife to improve their looks or size.

However, a new survey by medicalaccidentgroup.co.uk shows that 65 percent of Brits who′ve had cosmetic surgery now regret undergoing the procedure.

Therefore, one should rethink before deciding to go under knife. Cosmetic surgery may be an excellent way for getting the transformation one desires, but the change may also make one′s life miserable sometimes leading to dire consequences.

Here we list a few bad examples.

1.Not as good-looking as one desired.

Cases of cosmetic surgery failure have repeatedly made headlines. All surgery has risks. What′s more, many medical institutions are not qualified to carry out the procedures properly.

Yu Lian, 28, a native of Gansu province, China, talks about her plastic surgery nightmare, which left her face swollen, making her look decades older, Sept 24, 2013. Photos: IC

Nearly a quarter (24 percent) of Brits who′ve had cosmetic surgery encountered complications during or after the operation. These surgeries not only include all the risks of a normal surgery but they have many severe add-on risks. Basic risks include nausea, vomiting, headaches, fever and dangerous risks include blood clotting, suture complication, among others.

Tian Hui talks about her breast implant surgery failure which made her breasts swell, causing great pain. Eventually some of her fake breasts moved to other parts of her body. Photo taken in Guangzhou, Guangdong province, April 10, 2014.

People with low self-esteem hope cosmetic surgery can boost their confidence. However, experts warn that self-esteem can not be improved instantly by a mere outside change.

Zhang Yidong, 32, poses for a photo after his first stage of cosmetic surgery as he was trying to look like Lei Feng, in Hefei, Anhui province, March 3, 2014. Zhang said he is undergoing plastic surgery in order to memorialize Lei Feng and also to be "the most beautiful charity man."

Ageing is the accumulation of physical changes in a person over a period of time. Even if one undergoes plastic surgery, ageing will never stop and one will eventually become old.

A combined photo shows Jocelyn Wildenstein before and after plastic surgery.

Though there are no data on the expenses of cosmetic surgery since different hospitals charge different rates, it′s commonly known that these surgeries require deep pockets.

Rodrigo Alves from Brazil, a real life Ken Doll, who has spent 100,000 pounds on plastic surgery has vowed to go under the knife again even though his obsession has nearly killed him.

People undergo plastic surgery for different reasons. For those who want to be beautiful, if the outcome doesn′t turn out as expected, they may suffer from depression or anxiety.

A woman contemplates suicide by jumping off a building after her breast implant surgery caused complications, Shanghai, Sept 4, 2013.

Severe complications from plastic surgery may prove to be fatal. Though such cases are rare, the risks can′t be ignored. One of the highest-profile cases in recent years is that of Wang Bei. The 24-year-old singer from China′s Sichuan province died from receiving too much anesthesia while undergoing plastic surgery in 2010.

A woman was left fighting for her life after suffering a near fatal reaction to Botox. Hailey Terrell, 37, suffered eight strokes and a cardiac arrest after a Botox injection in her chin. Hailey technically died when her heart stopped beating for 30 seconds. But after relearning to walk, talk and write, she has since made a full recovery.

Nearly a quarter (24 percent) of Brits who′ve had cosmetic surgery encountered complications during or after the operation. These surgeries not only include all the risks of a normal surgery but they have many severe add-on risks. Basic risks include nausea, vomiting, headaches, fever and dangerous risks include blood clotting, suture complication, among others.