In order to establish if there is a case in medical or dental negligence, it will be necessary to obtain all of your relevant medical/dental records. These will need to be examined in consultation with you for the purposes of ascertaining what exactly went wrong and whether or not such actions or events constitute negligence, within the existing legal framework.
In order to prove that a doctor or dentist is negligent, it is necessary to establish that no reasonably competent practitioner in the relevant field, at the relevant time, with the same qualifications and expertise, faced with the same circumstances, would have acted in the same way.
If it is possible to show that a reasonable and competent body of medical or dental opinion would have acted in the same way, then the care is not considered negligent.
The second hurdle which has to be overcome is that of causation. This links the medical/dental negligence (if established) with the ultimate unfortunate outcome. In other words, it needs to be established that but for the error on the part of the doctors(s)/hospital(s)/dentist(s) the injury/poor result would not have occurred. If this cannot be proven, there is no case in Medical/Dental Negligence.
There are also strict time lines and similar to personal injury claims you have two years from the date of accident or injury.