We find that the best way is to attend the surgery on the first day, examine and discuss the findings. Start with simple procedures and progress from there. This simple softly softly approach seems to work fine. In certain situations we get the patient to take 1-2 tablets of Valium pre-op but this is rarely necessary.
If the tooth is completely covered by the gum it is unlikely to cause pain. If the tooth is partially erupted and especially if there is a flap of skin partially covering the tooth there is potential for trouble in the form of pain/infections.
If the teeth are not causing problems we generally leave them in place, a possible exception being if there is food trapping resulting in foul taste/smell and possible decay in the tooth next to it.
It has not been proven that a wisdom tooth pushing through can cause a domino effect resulting in crowding up the front teeth, so this is not a justification on its own to have teeth removed.
If the tooth is tilted forward bacteria can cause a cavity in the back of the tooth next to it so it is important to have it removed or monitor it regularly on an X-ray