I am currently in school to be a Dental Hygienist and my tattoos are definitely not welcome :( I usually wear a long sleeve underneath my scrubs or if i'll wear my lab jacket.
But my job is a different story. I am a legal secretary and they don't mind my tattoos AT ALL. Shorts, strapless dresses, t-shirts, flip flops... I don't have to worry about covering them up. Awesome, flexible, warm atmosphere with no issues.
But when I graduate next spring and have to find a job in the Dental Field... I will need to cover them up.