Well it depends how you get paid. Likley you will just be working as an associate dentist fresh out of school. If the dentist you are working for is paying you by hour and willing to pay you overtime I guess you could but really you are limited by the hours of the dental office unless you are cool with the dentist and he/she agrees to let you work in the office alone too. Another way to get paid is by percent of your production so you just need to work fast and slay through patients to make the most money. You can work for multiple dentists so you are working a lot of days a week but then you won't have any free time.