How can you detect blood poisoning from abscessed teeth?

Sepsis: Here is some general information: https://patient.info/health/sepsis-septicaemia-leaflet As you can see it is an emergency so if there is any doubt about this possibility then you should present urgently to see a doctor or dentist licensed in your area.

Culture : You could always obtain a blood culture ( lab) to detest bacteria in your blood but in reality you would know by the system wide symptoms you would have : fevers, chills, shaking, weakness etc.

Many signs: If your child has sepsis (blood poisoning ) then she will be very sick, have high fevers, and look lethargic. Cultures of the blood will show bacterial growth. This is remarkably rare from abscessed teeth, unless the child as a severe immune deficiency.

Highly unlikely: Abscessed teeth will result in infection but, not blood poisoning. Either way, a root canal or extraction if necessary will take care of the problem. Antibiotics may also be prescribed by your dentist.