Diabetes and Dental Care

01

Oral and Dental Complications

Periodontitis — the 6th complication of diabetes More frequent and more severe in diabetic patients (×3 risk). This relationship is bidirectional: poorly controlled diabetes worsens periodontitis, and chronic periodontitis deteriorates glycaemic control.

Periodontitis

Recognised 6th complication of diabetes

×3 higher risk compared to the general population
More severe forms with faster progression
Bidirectional link with HbA1c levels
Periodontal treatment reduces HbA1c by 0.4–0.6% (ADA 2023)
Annual periodontal assessment is essential

Xerostomia and Caries

Dry mouth — increased caries risk

Saliva is sweeter and less abundant
Dental plaque accumulation facilitated
Significantly increased caries risk
Prevention: rigorous brushing + fluoride
Saliva substitutes for severe xerostomia

Oral Infections

Immunosuppression — leukocyte dysfunction

Oral candidiasis more frequent
Lichen planus and denture stomatitis
Abscesses with more severe course
Delayed wound healing (microangiopathy)
Any infectious focus can destabilise glycaemia

Impaired Wound Healing

Microangiopathy and immunosuppression

Delayed post-surgical healing
Increased risk of dry socket after extraction
Implant osseointegration compromised if poorly controlled
Early follow-up at 48–72 h mandatory

02

Pre-Treatment Assessment

Mandatory history-taking before any treatment

Type of diabetes (1 or 2) and duration of the disease
Current treatments: insulin, oral hypoglycaemic agents (sulphonylureas, metformin, DPP-4 inhibitors…)
Most recent HbA1c value and date of the test
Systemic complications: retinopathy, nephropathy, neuropathy, cardiovascular disease
GP / diabetologist — contact details for coordination

HbA1c Interpretation — Decision Guide

HbA1c	Glycaemic Control	Clinical Guidance
< 7%	Well controlled	All treatments performable normally with standard precautions
7 – 7.5%	Borderline control	Conservative care OK · Surgery with enhanced precautions
7.5 – 9%	Poorly controlled	Defer non-urgent procedures · Contact diabetologist · Systematic antibiotic prophylaxis for surgery
> 9%	Very poorly controlled	Emergencies only · Hospital setting advised · Relative contraindication to elective surgery

No recent blood work available (> 3 months) Request baseline blood work before any surgical procedure: HbA1c, FBC, platelets, fasting glucose, creatinine. Contact the GP for any HbA1c > 7.5%.

03

General Precautions in Dental Practice

Appointment Planning

Optimal timing and conditions

Prefer morning appointments (cortisol naturally higher)
After a meal — never fasting
Patient must have taken their usual medication
Insulin-dependent patients: avoid peak action windows (rapid 45 min, long-acting 8–20 h)
Keep sessions short — split if necessary

Stress Management and Anaesthesia

Reducing adrenergic responses

Anxiolytic premedication if the patient is anxious
Local anaesthesia with vasoconstrictor: not contraindicated in well-controlled diabetes
Minimum effective epinephrine dose in poorly controlled patients
Adequate analgesia = less stress = less reactive hyperglycaemia

Hypoglycaemia Prevention

Emergency supplies and monitoring

Keep fast-acting glucose available (fruit juice, glucose tablets)
Remind patient to eat normally before the appointment
Watch for: confusion, cold sweats, tachycardia, trembling
⚠️ Beta-blockers may mask some signs of hypoglycaemia

Medications to Avoid

Glycaemia-interfering drugs

Corticosteroids: absolutely contraindicated — cause major hyperglycaemia
For inflammation: time-limited NSAIDs preferred over steroids
NSAIDs with caution if associated chronic kidney disease
Fluoroquinolones: interact with some oral hypoglycaemic agents

Systematic Oral Assessment in Diabetic Patients

Annual periodontal assessment: full probing, plaque index, bleeding on probing
Scaling and root planing strongly recommended — contributes to glycaemic improvement
DSR (debridement and root planing) at least twice yearly when active periodontitis is present
Full caries assessment and regular panoramic radiographs
Screen for xerostomia and provide adapted dietary and hygiene counselling

04

Endodontic Treatment

Well-controlled diabetes All root canal treatments can be performed normally with standard precautions. Resolution of periapical lesions may be slower if diabetes is poorly controlled.

Endodontic Protocol for the Diabetic Patient

Enhanced precautions adjusted to the level of glycaemic control.

Before the appointment

Morning appointment, after a meal — patient has taken their medication
Antiseptic mouthwash (chlorhexidine 0.12%) to reduce oral bacterial load
Antibiotic prophylaxis if HbA1c > 7.5% (amoxicillin 2 g or clindamycin 600 mg 1 h before)

During the procedure

Strict asepsis: gloves, rubber dam to prevent periapical contamination
Local anaesthesia with epinephrine: minimum effective dose in poorly controlled patients
Thorough NaOCl canal irrigation — eliminate all bacterial contamination

At the end of the session

Immediate canal obturation and coronal seal to prevent bacterial invasion
Post-operative antibiotic therapy for 5–7 days in poorly controlled patients
Radiographic monitoring of periapical healing at 3, 6 and 12 months

05

Extractions and Oral Surgery

Prerequisites for Elective Surgery

Situation	Guidance
HbA1c < 7% — well controlled	Surgery performable normally
HbA1c 7–7.5% — borderline control	Surgery with precautions, antibiotic prophylaxis considered
HbA1c > 7.5% — poorly controlled	Defer + contact diabetologist before elective procedure
Absolute emergency (abscess, acute pain)	Treat regardless, under antibiotic cover
Very poorly controlled (HbA1c > 9%)	Hospital setting recommended for surgical procedures

Adapted Surgical Protocol

Simple extractions, surgical extractions, periodontal surgery.

Antibiotic prophylaxis

Poorly controlled patient or extensive surgery: amoxicillin 2 g, 1 h before
Penicillin allergy: clindamycin 600 mg, 1 h before
Curative antibiotic therapy 5–7 days when confirmed infection is present

Haemostasis and suturing

Appropriate suture and drainage to optimise haemostasis (altered microcirculation)
Local haemostatic agent if bleeding persists (collagen sponge, bone wax)
Adequate pressure — no vigorous rinsing in the first 24 hours
If on anticoagulants/antiplatelets: adjust according to standard guidelines

Absolute contraindications

Local or systemic corticosteroids: hyperglycaemic — absolutely contraindicated
Prolonged NSAIDs with associated renal insufficiency
Pre-operative fasting without corresponding antidiabetic treatment adjustment

06

Implantology

Implant Decision Tree by Glycaemic Control

HbA1c	Implant Decision	Precautions
< 7%	Feasible	Success rate comparable to general population · Perfect oral hygiene · Antibiotic prophylaxis as standard
7 – 8%	With precautions	Inform patient of increased failure risk · Systematic antibiotic prophylaxis · Enhanced follow-up
8 – 9%	Defer	Optimise glycaemic control before placement · Provisional prosthetics in the meantime
> 9%	Contraindicated	Relative contraindication — very high risk of osseointegration failure

Well-controlled diabetes (HbA1c < 7%)

Implantology feasible normally

Success rate comparable to the general population
Peri-operative antibiotic prophylaxis recommended as standard
Flawless oral hygiene is mandatory
Implant follow-up at minimum every 6 months
Regular HbA1c monitoring throughout follow-up

Poorly controlled diabetes (HbA1c > 7%)

Special precautions required

Defer until better glycaemic control achieved
Inform patient of increased failure risk
Minimal osteoplasty and meticulous suturing
PRF (platelet-rich fibrin) to enhance healing
Faster provisional prosthetics if procedure is indicated despite all

Very poorly controlled diabetes + comorbidities In an unfavourable setting (HbA1c > 9% and/or severe complications), implantology is contraindicated. Orient towards prosthetic alternatives (conventional bridge, removable partial denture) with honest patient counselling.

07

Medications and Interactions

Drug Interactions to Know in Dental Practice

Dental drug	Interaction with diabetes	Guidance
Corticosteroids (local or systemic)	Major hyperglycaemia	Contraindicated — use time-limited NSAIDs instead
Fluoroquinolones (ciprofloxacin)	Potentiates oral hypoglycaemics	Monitor blood glucose — alert GP
NSAIDs (ibuprofen, ketoprofen)	Delayed healing if associated CKD	Limit duration — adjust if GFR < 30
LA + Epinephrine	Slight transient hyperglycaemia	Safe if patient has taken medication — minimum dose if poorly controlled
Metronidazole	Potentiates anticoagulants (warfarin)	Monitor INR if patient on warfarin
Amoxicillin	No significant direct interaction	First-choice antibiotic in dentistry
Benzodiazepines (anxiolysis)	No direct effect on blood glucose	Monitor O₂ saturation and hydration

Antidiabetic Drugs — In-Practice Risks

Sulphonylureas and insulin

Sulphonylureas (glibenclamide, gliclazide): hypoglycaemia risk if meal is delayed
Rapid-acting insulin: peak at 45 min → avoid treatment at this time
Metformin: no direct hypoglycaemia, but monitor renal function
DPP-4 inhibitors, GLP-1RA: low hypoglycaemia risk when used alone
If hypoglycaemia occurs: immediate fast-acting sugar (juice, glucose tablets)

Metformin and Major Surgery

General anaesthesia — hospital setting

Stop metformin 24–48 h before general anaesthesia (lactic acidosis risk)
Resume after confirming post-operative renal function
Mandatory coordination with the anaesthetist and diabetologist
Monitor blood glucose intra- and post-operatively

08

Sample Prescriptions

Pre-operative antibiotic prophylaxis

Rx 1

Amoxicillin 2 g

Single oral dose, 1 h before the procedure

Poorly controlled diabetic patient (HbA1c > 7.5%) or extensive surgery

Penicillin allergy

Rx 2

Clindamycin 600 mg

Single oral dose, 1 h before the procedure

Alternative when documented β-lactam allergy is present

Post-operative antibiotic therapy

Rx 3

Amoxicillin 1 g

1 tablet × 3/day with meals — 5 to 7 days

Poorly controlled patient after surgery or root canal treatment

Post-operative analgesics

Rx 4

Paracetamol 1 g

1 tablet / 6 h — 3 to 5 days

Ibuprofen 400 mg

1 tablet / 8 h with food — 3 days max

Avoid ibuprofen if associated CKD (GFR < 30 mL/min)

Post-surgical local antisepsis

Rx 5

Chlorhexidine 0.12%

Mouthwash × 2/day — 7 to 10 days

Start 24 h after extraction. Soft surgical toothbrush

Oral candidiasis

Rx 6

Miconazole oral gel 2%

Apply × 4/day after meals — 7 to 14 days

Fluconazole 150 mg

1 tablet/day — 7 to 14 days (extensive forms)

⚠️ Fluconazole potentiates sulphonylureas → monitor blood glucose

09

Post-Operative Follow-Up

Post-Surgical Follow-Up Protocol

Enhanced follow-up is essential given the risks of delayed healing and infection.

Review at 48–72 hours

Absence of infection signs: swelling, redness, pain, suppuration
Quality of wound healing — early detection of dry socket
Patient compliance: hygiene, medication, appropriate diet
Verify correct antibiotic intake as prescribed

Post-operative oral hygiene

Gentle brushing with a surgical toothbrush after the first 24 hours
Chlorhexidine 0.12% mouthwash × 2/day for 7–10 days
No vigorous rinsing in the first 24 hours post-extraction
Cold, soft diet for the first 48 hours

Slow healing — complementary options

Local hyaluronic acid to stimulate gingival healing
Alvogyl® for dry socket after extraction
PRF (platelet-rich fibrin) in implantology to improve osseointegration

Patient education and prevention — key messages

Twice-daily brushing + floss + interdental brushes — rigorous hygiene is mandatory
Six-monthly scaling, especially when periodontitis is present
Periodontal treatment reduces HbA1c by 0.4–0.6% (ADA 2023)
Watch for: gingival bleeding, tooth mobility, dry mouth
Maintaining a healthy mouth improves diabetes control
Visit the dentist even in the absence of pain — annual preventive check-ups

10

Clinical FAQ

Yes. Local anaesthesia with a vasoconstrictor (epinephrine) is not contraindicated in well-controlled diabetic patients. It provides better analgesia, reduces bleeding and decreases intraoperative stress — all of which benefit glycaemic stability. In a poorly controlled patient or one who has not taken their insulin, use the minimum effective dose. Epinephrine at standard dental doses has no significant impact on blood glucose when the patient is properly managed.

For elective surgical procedures (implants, multiple extractions, periodontal surgery), an HbA1c > 7.5% is a signal to contact the GP and consider deferral until better control is achieved. Below 7%, surgery can be performed normally. Between 7 and 7.5%, enhanced precautions apply (antibiotic prophylaxis, close follow-up). In absolute emergencies (abscess, cellulitis), treat regardless under antibiotic cover, irrespective of the HbA1c level.

No, not systematically. Antibiotic prophylaxis is indicated in specific situations: patient with HbA1c > 7.5%, extensive surgery (implants, bone surgery), history of post-operative infections, or immunocompromised patient. For a well-controlled diabetic patient undergoing a simple extraction, antibiotic prescription is not justified and unnecessarily contributes to resistance. Prescribing should remain targeted and evidence-based.

Stop treatment immediately and give the patient a fast-acting glucose source: 150–200 mL of fruit juice, 3–4 glucose tablets, or 2–3 sugar lumps. If the patient is conscious but confused, let sugar dissolve under the tongue. If unconscious: call emergency services immediately. Monitor for 15–20 minutes and do not resume treatment. For the next visit, remind the patient to eat normally and to inform you if their meal is delayed. Having fast-acting glucose available in the practice is mandatory.

Yes, under certain conditions. Well-controlled Type 1 diabetes (HbA1c < 7%) does not constitute a contraindication to implantology — long-term success rates are comparable. In insulin-dependent patients where achieving HbA1c below 7% is difficult, implantology remains possible if the indication is strong, but the patient must be informed of the higher failure risk. Systematic antibiotic prophylaxis, enhanced follow-up and perfect oral hygiene are mandatory. At HbA1c > 9%, implants are contraindicated.

No. Corticosteroids (local or systemic) are absolutely contraindicated in diabetic patients because they cause major and prolonged hyperglycaemia, which can completely destabilise diabetes and worsen infections. To manage post-surgical inflammation, use time-limited NSAIDs (3–5 days), with caution if associated renal insufficiency is present (GFR < 30 mL/min). Paracetamol remains the first-choice analgesic.

The scientific evidence is now robust: periodontal treatment (scaling and root planing) in diabetic patients produces a mean reduction in HbA1c of 0.4 to 0.6% — an effect comparable to adding a second-line antidiabetic medication (ADA 2023). The relationship is bidirectional: treating periodontitis improves glycaemic control, and better diabetes control improves the response to periodontal treatment. This information must be communicated clearly to both the patient and their GP.

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References and Guidelines

American Diabetes Association (ADA 2023) — Standards of Medical Care in Diabetes. Diabetes Care. 2023;46(Suppl 1).
Haute Autorité de Santé (HAS) — Guide du parcours de soins du patient diabétique de type 2. 2014 (updated 2023).
FDI / IDF — Oral Health for People with Diabetes. Joint Statement, 2018.
ADF & UFSBD — Dental recommendations for patients with chronic conditions. 2022.
Sanz M, Ceriello A, Buysschaert M, et al. Scientific evidence on the links between periodontal diseases and diabetes. J Clin Periodontol. 2018;45(2):138-149.
Lalla E, Papapanou PN. Diabetes mellitus and periodontitis: a tale of two common interrelated diseases. Nat Rev Endocrinol. 2011;7(12):738-48.
Chapple ILC, et al. Interaction of lifestyle, behaviour or systemic diseases with dental caries and periodontal diseases. J Clin Periodontol. 2017;44(Suppl 18):S39-S59.
Oates TW, Dowell S, Robinson M, McMahan CA. Glycemic control and implant stabilization in type 2 diabetes mellitus. J Dent Res. 2009;88(4):367-71.