Q. My dentist had given me the first part of my root canal, no infection but was in pain due to tooth trama (back molar) , anyway, my tooth and nerve were aggrevated so bad that I had a lot of drainage, so he only covered with a cotton swab and i go back on Monday, this was done Thursday. Is it ok to have a cotton swap in the tooth without a temp covering? I was told if I had a covering that gas could build up and i’d be in more pain until it was finished. Also, can bacteria build up on the cotton swab and cause toxic shock syndrome if the same swab is left for a few days? thanks!,