Im seeing a dentist tom, the last time i saw her she was cleaning my teeth cause i had a lot of bacteria, is it possible for the bacteria to go to my brain? im thinking of asking for antibiotics,nothing shows up on mri's , no contrast used,is it poss?

It is a common practice for those with heart valve lesions, to take amoxcillin, before, during and after teeth cleaning. There is no evidence that bacteria from cleaning teeth can enter the very tight "blood brain barrier". Unless you are allergic, there is no harm in taking this antibiotic for short term. It might be a good substitute for you than an anti-anxiety medication.

Bacteria in mouth is common and dental procedures will not cause any issue in absence of an active infection such as an abscess Routine antibiotics are not needed if no cardiac valvular disease or active infection elsewhere

There are more bacterial cells in your mouth than there are people on this planet. Some enter your blood stream every time you clean your teeth or eat a meal. Antibiotics are given before a dental cleaning if patient has artificial heart valve. No, a dental cleaning will not affect your brain. Best advice I can give you is floss (or WaterPik) daily to reduce levels of bacteria.