Is a painless lump on the gum of an 11-year-old boy normal if it has been there 4 weeks and hasn't shrunk even after a course of antibiotics from the dentist who thought it was caused by an abscess?
If it is painless then I seriously doubt that it is an abscess? If the antibiotics have not decreased the size then it could very well be just a bony protrusion that is just now developing and is normal. Another possibility is that it could possibly be the result of a cracked root on that tooth. I suggest that you have a periodontist check this out. An x-ray will show if the root is cracked.
An abscess will only fully heal when it has been treated with root canal therapy, is drained by a professional or the tooth is extracted. Most dentist will prescribe antibiotics and pain killers to take for 5-7 days. After the 4th day of taking antibiotics you should be able to feel some relief or the abscess might pop and begin to drain. Even if it does pop or the pain goes away it doesnt mean…
Yes, however, you need to brush VERY softly around the abscess, rupturing it can cause infection and could potentially be fatal if not treated. You need to get into a dentist or visit an emergency room for antibiotics. More than likely that tooth will need to be extracted as once an abscess forms it is no longer salvageable through root canal therapy.