After all on 4 implants gums are white. Is this normal gum healing since they were so badly infected?

It's typical for an implant surgeon to advise the patient not to brush until the first follow-up visit after the procedure. It sounds like you may have a surface of plaque or biofilm developing on the surface of your tissue. I would advise you to visit your doctor to verify.  

i think you should go and visit your doctor, if you had the proven protocol, by nobelboicare , they can be loaded, if not, you should not put pressure over the implants, immediately . there could be 2 things, or either , bad cleaning, plaque, and sutures being infected, or izquemia, of the denture putting to much pressure, you should check, this as soon as possible.

With an all on 4 type procedure the new prosthesis replaced both the teeth and the gums.  Usually in the temporary teeth, the teeth look like teeth and the gums look like gums, healthy light pink.  Sometimes some doctors choose to use a white material for the gums, this is not common and may not look right but you need to check that the white is actually your living gum tissue not the replacement gum.  Under the bridge 5 weeks after the surgery the gums should be healthy light pink in colour.