Orthodontics and Blood Thinners UK

Types of anticoagulants and antiplatelets

Anticoagulant and antiplatelet medications are prescribed to reduce the risk of blood clots, strokes, deep vein thrombosis, and pulmonary embolism. They fall into two main categories. Anticoagulants include warfarin (a vitamin K antagonist that requires INR monitoring), and direct oral anticoagulants (DOACs, also called NOACs) such as apixaban (Eliquis), rivaroxaban (Xarelto), and dabigatran (Pradaxa). These are increasingly prescribed because they do not require regular blood test monitoring. Antiplatelet drugs include clopidogrel (Plavix) and low-dose aspirin, commonly prescribed after cardiac events or stent placement. Dual antiplatelet therapy (DAPT) — usually aspirin plus clopidogrel — is used after coronary artery stenting and carries a higher bleeding risk than single-agent therapy.

Why blood thinners matter for orthodontic treatment

The vast majority of orthodontic treatment — fitting brackets, placing wires, taking impressions, fitting removable appliances — carries no significant bleeding risk and is entirely unaffected by anticoagulant use. The primary concern arises during tooth extractions, which are sometimes needed as part of orthodontic treatment planning to create space or address impacted teeth. Extractions on patients taking anticoagulants or antiplatelets require additional planning to manage haemostasis (bleeding control). The risk of a serious bleeding episode following a dental extraction on anticoagulation is low when proper local haemostatic measures are used, but it is higher than in a non-anticoagulated patient. The British Dental Association and SDCEP guidance confirms that most dental extractions can be safely carried out without stopping anticoagulant medication.

Extraction management on warfarin

For patients on warfarin, the key step before any extraction is to check the international normalised ratio (INR). An up-to-date INR result — ideally within 24 to 72 hours of the procedure — should be obtained. Current SDCEP (Scottish Dental Clinical Effectiveness Programme) guidance recommends that extractions can proceed if the INR is stable and at or below 4.0; some clinicians apply a more conservative threshold of 3.5. If the INR is above the agreed threshold, the procedure should be postponed and the prescribing physician contacted. The oral surgery team will use local haemostatic measures: these include resorbable haemostatic packing such as Surgicel placed in the socket, the use of resorbable sutures (not requiring removal), and prescribing a 5% tranexamic acid mouthwash — a clot-stabilising agent used four times a day for two days after the extraction. Warfarin should not be routinely stopped or reduced without liaison with the prescribing physician, as this increases the patient's risk of a clot or embolic event.

NOACs (direct oral anticoagulants) and extractions

Unlike warfarin, DOACs such as apixaban, rivaroxaban, and dabigatran do not require routine pre-operative blood test monitoring. SDCEP guidance for simple dental extractions states that NOACs should not be routinely stopped before simple extractions — the risk of doing so (rebound thromboembolic events) outweighs the modest reduction in bleeding risk. Local haemostatic measures — resorbable packing, sutures, and tranexamic acid mouthwash — are the primary management strategy. For patients on dabigatran, some clinicians time the extraction to coincide with the end of the dosing interval (i.e., just before the next dose is due) to minimise peak drug effect, but this should be discussed with the prescribing physician. For complex or multiple extractions, referral to a hospital dental department or specialist oral surgery service with anticoagulation experience is appropriate.

Antiplatelet considerations

Single antiplatelet therapy with aspirin or clopidogrel carries a lower bleeding risk than anticoagulants for most dental extractions, and should not be stopped. Local haemostatic measures are still advisable. Dual antiplatelet therapy (both aspirin and clopidogrel together) carries a higher bleeding risk, and it is prudent to discuss with the prescribing cardiologist before proceeding with extractions — though stopping DAPT is rarely appropriate without cardiology input, as the risk of stent thrombosis is serious. The orthodontist should note which antiplatelet drugs are being taken and refer complex cases to an oral surgeon.

What to tell your orthodontist

Always tell your orthodontist about any anticoagulant or antiplatelet medication at your initial appointment or as soon as the medication is started. Include the drug name, dose, indication (why you take it), and the name of the prescribing doctor. If your INR is monitored, let the orthodontist know your typical range and your most recent result. Bring a current medication list to appointments. This information allows the orthodontist to plan the safest treatment sequence — for example, completing extractions in a single planned session with appropriate haemostatic preparation, rather than as an unplanned emergency. It also helps identify whether your case requires referral to a specialist oral surgery team.

GP liaison for complex cases

Orthodontists and oral surgeons may contact your GP or cardiologist to discuss your anticoagulation management before planned extractions. This is standard practice and should not alarm you — it is a safety precaution. In most cases, the outcome of this liaison is confirmation that the drug should be continued at its current dose, with local measures used at the time of extraction. Only in rare, complex cases (multiple extractions, uncontrolled INR, complex anatomy) might temporary modification of anticoagulation be considered under the supervision of the prescribing physician. Patients should never self-adjust anticoagulant doses without medical direction.

Braces and appliances — no additional risk

For the non-surgical aspects of orthodontic treatment, anticoagulant and antiplatelet medication poses no additional clinical risk. Fitting and removing fixed braces, placing archwires, adjusting appliances, taking photographs and radiographs, and fitting retainers all proceed as normal. There may be increased gum bleeding when brushing during treatment — this is largely a hygiene issue and is managed with thorough plaque removal and regular dental hygiene appointments. Patients on anticoagulants should maintain excellent oral hygiene to minimise gum inflammation, which can exacerbate bleeding tendency.

Useful related pages

This guide is for general information only. It is not a diagnosis, treatment plan, or substitute for advice from a registered dentist or orthodontist.