Here’s the third paragraph….. Could you check it please?
Insurance coverage is not enough to pay for medical attention. A person can be paying her or his insurance mostly; but coverage is not enough to pay for a doctor appointment. In some cases, insurance companies do not want to cover most of the medical attention provided by doctors or hospitals. My mother went to the dentist six months ago to seek treatment for a toothache. After several exams, the doctor discovered that she needed three orthodontics. The final cost for her treatment was calculated to be seven thousand dollars; she did not have the option and went to our country (El Salvador) and received the same treatment for only seven hundred dollars. Is it necessary to go to another country to do this?
I do not want to suggest that they should have to pay for our illnesses, but medical service providers and insurance companies have to be in agreement to provide high quality medical service with affordable costs.

Congrartulations! Well written, spelt and punctuated. However, I would suggest that you use a full stop after “seven thousand dollars” as your following comment is a full sentence, and not just an adjunct to the previous sentence.
Looks fine to me.