Research

Does deep cleaning actually help, and does it affect blood sugar too?

What was studied

Randomized controlled trials evaluating scaling and root planing (SRP) for periodontitis, including trials specifically measuring whether treating gum disease affects blood sugar control in people with type 2 diabetes.

Main findings

SRP is well-established as effective for reducing gum inflammation, pocket depth, and bleeding, regardless of whether it's done full-mouth or quadrant-by-quadrant — both approaches show meaningful improvement. In people with type 2 diabetes, several trials found SRP led to a measurable, short-term reduction in HbA1c (a blood sugar marker) at 3-4 months, though evidence for whether that holds beyond 4 months is inconsistent, and at least one larger trial found no benefit.

Limitations

The diabetes-related findings are mixed between studies, with larger trials generally showing more modest results than smaller ones — this remains an active, unsettled area of research.

What this means for patients

The core benefit of deep cleaning for gum disease itself is well-supported. If you have diabetes, it's reasonable to ask your dentist and physician whether treating gum disease could help your blood sugar control, while understanding that specific evidence is still developing.