My corrections and changes to your text are shown below:
In a recent past, several people didn't use to undergo cosmetic surgery due to the poor quality of the *equipment which was available. **Sometimes, they weren't reliable at all. Nowadays, a great advance in technologies and the expertise of some doctors, give people more hope of success. Although, these procedures have been approved by many people, it's important to check which equipment is available, where the clinic is located, how past patients feel, etc. It's important to question and analyse everything so that you won't be frustrated in the future. Weighing up the pros and cons we can say that people can feel better with their appearance, but, on the other hand, if you are not satisfied with the change, it's almost impossible to revert it. So it's crucial to be certain about what you want.
*"Equipment" não tem plural (incontável).