thanks for sharing your concern.
how do you know it is titanium screw?did you undergo dental implant
treatment sometimes back?
when and for what?
i would suggest you to visit your dentist
and get an xray done if so.or is it any post and core you are taking about?
please give detailed history so that i can explain you better.
is there any other symptom associated like pain,infection etc?
i would suggest you to visit your dentist and confirm it with xray after that if required it can be surgically removed or rebuilt depending upon its nature.
hope it helps