Thanks for sharing your concern.
you history suggests that you got the tattoo done on teeth but is it on enamel,or dentin?
If the tattoo involves within the enamel of teeth,nothing to worry,as the chance of infection is very less.it is the hardest structure in your mouth and impermeable too.
but if the tattoo is placed deep within dentin,you should take antibiotic coverage as it can lead to many heart related problems like SABE and rheumatic fever
etc due to bacterial colonization.
Please produce your medical history too whenever you are getting any dental treatment done.so that prophylactic dosage can be given.
I would suggest you to visit your dentist
soon and get the required help.
meanwhile do maintain good oral hygiene