I have ulcers all in my mouth both sides; think is its symptomatic to 2nd vaccine; My left side of my jaw and mostly the gum line is swollen; I am little uncomfortable but its not serious; I have now I had a tooth that was giving me problem; Infection; This is a spontaneous report from a contactable consumer (patient). A patient of unspecified age and gender received second dose of BNT162B2 (PFIZER-BIONTECH COVID-19 VACCINE, Formulation: Solution for injection, Batch/Lot number: Unknown), via an unspecified route of administration on an unspecified date as single for covid-19 immunisation. The patient medical history and concomitant medications were not reported. Historical vaccine included first dose of BNT162B2 for covid-19 immunisation and no reaction from first dose. Consumer stated, "Well patient had no reaction from 1st dosage of COVID that was actually wonderful the only person probably that had energy from it. The patient had 2nd dose on 13th (Further clarification unknown) so that's make it as 3rd day, patient have now had a tooth that was giving patient problem, but patient can push down the tooth and patient have no pain from that it doesn't mean patient don't need dental work, however patient have taken some antibiotics (Further clarification unknown) to plead the infection down. The patient wasn't taking them 3 or 4 a day, just 1 a day, so the 3rd day today patient have ulcers all in patient's mouth on both sides, however where the side the tooth was giving patient problem and that never happen with any tooth before, and patient don't think it's a dental issue (Further clarification unknown) so what patient think was its symptomatic to 2nd vaccine. The patient's left side of jaw and mostly the gum line was swollen which patient know there could be some swelling but it all over, everything patient had was over with the problem. The patient's brother was a doctor (Further clarification unknown) he told patient stop using all mouth wash get one that has no sugar because it give different 'candidiasis' (Further clarification unknown) problem so yes patient trying to research, He was a pathologist but he has been researching it very much about oral issue, patient came across where what patient can read was that a lot of people have had or some people have had were the taste was metallic (Further clarification unknown), patient have that. That was the first symptom patient not thinking so much about the ulcers, what patient asking that was one of the complaints of it. Because if it's not then patient trying to get dentist to took at the tooth, but patient don't think its tooth it's just patient never had this happen with patient with that tooth." Consumer stated not in 'anaphylactic' (Further clarification unknown) stage little uncomfortable but it's not serious but patient just trying to find if this was the symptoms what other people had. Consumer was informed about Pfizer medical information department was provided the details of Pfizer medical information department. Therapeutic measures were taken as a result of i have ulcers all in my mouth both sides; think is its symptomatic to 2nd vaccine, i have now i had a tooth that was giving me problem. The outcome of events was unknown.  The lot number for the vaccine, [BNT162B2], was not provided and will be requested during follow up.