White/clear material in mouth - pseudomembranous candidosis?

Dear Doctors.

I am a dental student. On Feb 11th 2011 I had a low risk needlestick injury when administering a local anaesthetic. Needle inserted in my finger ~2mm. I followed protocol, squeeze wound, wash and dress it.
Asked the patient all the questions to determine the risk. He answered no to them all e.g. "Have you ever injected drugs?" etc.

Occupational health weren't interested in following this up as it was apparently such low risk.
Nonetheless, I went for an HIV DUO test at exactly 28 days after the possible exposure. The result was negative.
How much can I take from this result? Can I take it as being conclusive?
Do I need to go for another test at 3 months - ELISA or another DUO ?

I recently started getting a white/clear-coloured material accumulating in my mouth daily, onset seems to be several hours after I have a dry feeling in my mouth.
White/clear coloured material accumulates on the buccal mucosa ONLY, nowhere else, not found on the tongue, tonsils, posterior pharyngeal wall etc. It is easily removed by running a finger over it. Amount collected is about 3-4mm on my finger tip. There is no bleeding or red surface, no pain or altered taste/sensation etc. The material has no smell, is kind of stringy. I personally think it is epithelium but I am not sure...

I previously did excessively use listerene antibacterial mouthwash and toothpaste. I also used an antibacterial mouthwash TCP. Has this caused my oral mucosa to exfoliate or shed?
Or is this a sign of oral candidosis? I do not think it is candidosis because I don't have the signs and symptoms.

I just want some clarification on this issue please because I felt I was in the clear after my negative result and now this is happening...

Thanks.

[Dr Mervyn Tyrer, MB BCh; Dip HIV Medicine, Freedomhealth London]

You had a low risk incident after a careless exposure by yourself - you're the medic and you should have taken more care. That said, you had a reliable test at 28 days which was negative. You are negative. You are letting your imagination run away with itself. Your mouth symptoms are irrelevant. Merv

[Craig90]

Thanks for your quick reply Dr Tyrer.

I think I am becoming a hypochondriac, if only I didn't have that sharps incident I wouldn't care about this "symptom".
I just want to confirm that the problem I described above is not indicative of candidosis associated with HIV infection?

My last question - have you ever seen someone test HIV negative with an HIV DUO test then subsequently go on to test positive at the 3 month mark with an ELISA test?

Thanks a lot.