I have a small bubble on my top gum. I doesnt hurt all the time just sometimes. When I push on it pus come out and it smells and taste really bad. I have been telling my dentist for a year that Ive had a cavity but he says he cant see one. Any idea what this could be?
Thanks for your query, I have gone through your query. The bump on the gum could be because of the tooth infection secondary to the decay, or it can be secondary to gum infection. Consult an oral physician and get it evaluated and take a radiograph to rule out tooth or gum infection. If it is gum or tooth infection You can take a course of antibiotics and analgesics like amoxicillin 500 mg and metronidazole 400 mg TID for 5 days(if you are not allergic).  After taking antibiotics you can get the tooth treated with RCT(if bone support is fine) for tooth infection. If it is gum infection then get your teeth cleaned once and maintain the oral hygiene. If needed grafts can be placed to make the tooth firm. Do saline gargling. I hope my answer will help you, take care.