I don`t know anyone specifically for that job, but it could be of interest to a semi - retired dentist, or a new dental school graduate who had not yet established a practice. Some larger ships have over 1500 crew, and I have seen several elderly persons who have had dental problems on board ship. A doctor may be able to help in emergercies, but I was thinking in terms of very long cruises, or in cruising areas where there were no dentists on land. -- just a thought --.