How We Use Your Medical History

An oral surgeon needs your full medical history because removing a third molar is a surgical procedure with a controlled wound, and because most of it is done under anaesthesia. Two systems are being managed at once: the healing of a bone socket in a mouth full of bacteria, and a person's breathing, heart rate and blood pressure over a period of sedation. A short list of medications and diagnoses changes how each of those is planned.

Almost everything on the intake form changes nothing. You can take a statin, a thyroid replacement, an antihistamine, an inhaler you use twice a year, or a daily antidepressant, and the plan for your surgery will be identical to the plan for someone taking none of them. That is worth saying plainly, because patients often assume the form is a screening test they might fail. It is not. It is a way of finding the handful of answers that are load-bearing before the day of surgery rather than during it.

The answers that are load-bearing are narrow and predictable. Anticoagulants and antiplatelets. Bisphosphonates and other antiresorptive drugs. Diabetes that is not under control. A cardiac history. Pregnancy. A latex allergy. Any previous problem with an anaesthetic, in you or in a close blood relative. Each of these changes something specific about the planning, and each is far easier to work around when it is known three weeks out.

Taking an anticoagulant or an antiplatelet drug changes how the extraction site is closed and how the first day afterwards is managed, not whether the tooth can come out. A socket that would normally be left to clot on its own may instead be packed with a resorbable haemostatic material, sutured more thoroughly, and held under firm pressure for longer before you are discharged. The appointment is often scheduled earlier in the day and earlier in the week, so that the hours when bleeding is most likely to restart fall inside working hours.

This group covers more drugs than most patients realise. Warfarin, the direct oral anticoagulants, low-dose aspirin taken as a daily preventive, clopidogrel and the other platelet inhibitors, and injectable agents all belong on the form. So does dual therapy, where two of them are taken together, which is a materially different situation from either one alone. Recent fish oil at high dose and some herbal supplements are worth listing too, not because they are dramatic but because they are invisible unless you write them down.

What matters clinically is less the name of the drug than why you are on it. Someone anticoagulated after a recent coronary stent, a mechanical heart valve or a pulmonary embolism sits in a different risk category from someone on a long-standing preventive dose for atrial fibrillation. That reason, and the date the drug was started, are the two facts that shape the plan. If you know your most recent INR or the date of your last relevant blood test, bring it.

The practical consequence of a yes here is coordination. A note goes to your prescribing physician, an answer comes back, and the plan is fixed before you arrive. That correspondence takes days rather than minutes, which is the single strongest reason to disclose it at the consultation rather than on the morning of the procedure.

Taking a bisphosphonate or another antiresorptive drug does not by itself rule out removing a third molar, but it is the one history that most often changes the decision about whether to operate at all. These drugs slow the turnover of bone. Extraction sockets heal by remodelling bone. Where that remodelling is suppressed, a small fraction of sites fail to heal and leave exposed bone in the jaw, a condition known as medication-related osteonecrosis of the jaw.

The size of that risk varies enormously across the drug class, and lumping it together is what makes patients frightened out of proportion. An oral bisphosphonate taken weekly for osteoporosis for under four years carries a risk usually quoted in the range of hundredths of a percent. Intravenous antiresorptive therapy given monthly in an oncology context carries a risk one to two orders of magnitude higher. Denosumab, romosozumab and antiangiogenic agents each behave differently again. The route, the dose, the indication and the cumulative duration are all separate questions on the form for that reason.

When the answer is yes, three things typically change. The threshold for operating rises, so an asymptomatic tooth that is causing no problem is more likely to be monitored than removed. If surgery does proceed, the technique becomes more conservative: less bone removal, atraumatic elevation, primary closure over the socket where possible. And the follow-up schedule lengthens, because the sites that fail declare themselves at six and eight weeks rather than at day five.

This is also the history most often lost in translation. Patients report the injection they had at the oncology clinic as a treatment for their cancer, not as a drug with a dental consequence, and an infusion given twice a year does not feel like a medication in the way a daily tablet does. If you have ever had an injection or infusion for bone strength, bone protection or bone metastases, write it down even if you cannot remember the name.

The form asks about diabetes twice: whether you have it, and what your most recent HbA1c was. The second question is the one that carries the information. A diagnosis of diabetes that is well controlled changes very little about a third molar extraction. Persistent hyperglycaemia changes several things at once, and the distinction between the two is not visible from the diagnosis alone.

Sustained high blood glucose impairs neutrophil function and slows collagen formation, so wound healing runs behind schedule and the rate of post-operative infection rises. Vascular changes in the small vessels reduce perfusion at the socket. Working in the other direction, the surgery itself and the days of altered eating that follow it push glucose around, which is why a patient on insulin has a fasting window that has to be planned rather than simply assigned.

A yes here usually changes scheduling before anything else. Early appointments, a defined plan for the fasting period made with the physician who manages the diabetes, and a lower threshold for prophylactic antibiotic cover and for an early post-operative review. Where the HbA1c is high enough that healing would be materially compromised, the honest conversation is about whether a few months of improved control before an elective removal produces a safer result. That is a delay, not a refusal, and it is a decision made with you rather than announced to you.

The cardiac questions exist because anaesthesia is a cardiovascular event. Sedative agents lower blood pressure and blunt the reflexes that correct it. Local anaesthetics containing epinephrine raise heart rate transiently. Anxiety before a procedure raises it further. A heart with normal reserve absorbs all of this without notice; a heart with limited reserve may not.

The details that shape the plan are specific: the date of any myocardial infarction, the date and type of any stent, whether angina is stable and what provokes it, the presence of heart failure and how far you can walk before you are short of breath, any implanted pacemaker or defibrillator with its manufacturer and model, and any prosthetic valve. Functional capacity is often more useful than the diagnosis itself. A patient who climbs two flights of stairs without stopping has told us more in one sentence than a list of drug names does.

What changes with a yes is usually the depth and location of anaesthesia rather than the surgery. A case that would have been done under deep sedation may be done under local anaesthetic with minimal sedation instead, which keeps the cardiovascular effect small. Monitoring may be extended. Some cases are moved to a hospital operating room with an anaesthesiologist and immediate access to cardiac support, which is a decision about the safest setting, not a judgement about the difficulty of the tooth. Certain valve and endocarditis histories also trigger antibiotic prophylaxis before the procedure under the current cardiology guidance.

A wisdom tooth can be removed during pregnancy when there is an active problem such as infection or uncontrolled pain, and delaying treatment of an infection is generally the greater risk to both patient and pregnancy. What changes is almost everything around the extraction: the timing within the pregnancy, the imaging, the anaesthetic plan, the drugs prescribed afterwards, and the position you lie in during the procedure.

Elective removal of an asymptomatic third molar is normally deferred until after delivery, because there is no reason to accept even a small addition of risk for no clinical gain. Where treatment is needed, the second trimester is conventionally preferred: organogenesis is complete, and the uterus is not yet large enough to make positioning difficult. Radiographs are taken only when they will change the treatment, with abdominal and thyroid shielding, and a modern panoramic exposure delivers a dose far below the threshold associated with fetal effects.

Sedation planning is the part that changes most. Many sedative agents lack safety data in pregnancy, so procedures are more often done under local anaesthetic alone. From the middle of the second trimester onward, lying flat can compress the inferior vena cava and drop blood pressure, so the chair is tilted and a wedge is used. Post-operative analgesia and any antibiotic are chosen from the agents with the longest record of use in pregnancy, which is a narrower list than usual.

The form also asks whether you are breastfeeding, and it asks whether pregnancy is possible rather than only whether it is confirmed. Neither question is an intrusion for its own sake. Both change which drugs are on the table.

Latex is the one item on this list where a yes changes the room rather than the plan. A surgical operatory contains latex in gloves, in the bung of some drug vials, in tourniquets, in some blood pressure cuff tubing, in bite blocks and in parts of certain airway equipment. A true type I hypersensitivity to natural rubber latex can produce anaphylaxis on contact or on inhalation of glove powder, which means the exposure has to be removed rather than reduced.

Knowing in advance allows the case to be scheduled as the first of the day, when airborne particulate from previous cases has settled overnight, and allows a latex-safe cart to be assembled and the operatory checked item by item. None of that can be improvised while a patient is in the chair, which is why this question sits on a form rather than being asked on arrival.

The form also asks about avocado, banana, kiwi, chestnut and papaya, which reads as a strange question on a dental history. There is a well-described cross-reactivity between latex proteins and proteins in those foods, and a patient who reacts to several of them may have an undiagnosed latex sensitivity. It is a screening question, not a dietary one.

A previous bad reaction to an anaesthetic is one of the most useful things you can put on the form, because it converts an unknown risk into a known one that can be planned around. The anaesthetic plan is built backwards from what happened last time: which agent, at what point in the procedure, and what was done about it. In most cases a different agent or a different route removes the problem entirely.

Several distinct events get reported as the same sentence, and separating them is most of the work. Prolonged nausea and vomiting after a previous general anaesthetic is common, unpleasant, and straightforwardly managed with a different antiemetic strategy. Difficulty being woken, or an unusually long recovery, may point to a metabolic or airway issue. A rash, wheeze or drop in blood pressure during induction suggests a true drug allergy and warrants formal allergy testing before the next exposure. Prolonged paralysis after a general anaesthetic suggests pseudocholinesterase deficiency, which is inherited and worth knowing about permanently.

The form asks about blood relatives for one reason in particular. Malignant hyperthermia is a rare inherited reaction to certain volatile anaesthetic agents and to succinylcholine, and it may never have been triggered in you because you have never been exposed. A family history of an unexplained death or a high fever under anaesthesia is therefore a genuine finding even when your own anaesthetic history is unremarkable. It does not prevent third molar surgery; it selects the agents used and, in some cases, the setting.

Difficulty with local anaesthetic belongs here too. Patients who report that dental injections never seem to work on them are often describing an anatomical variation or a previously inflamed field rather than a failure of the drug, and knowing it in advance changes the technique and the time allowed for the appointment.

The pattern across all seven is the same. A yes changes the preparation, the technique or the setting, and it rarely changes whether the tooth comes out. The table below sets out the usual direction of each.

Two entries in the right-hand column do the most damage when they are missed. Anticoagulation and antiresorptive history both need a reply from another clinician before a date can safely be fixed. A disclosure made on the morning of surgery in either category will usually move the surgery, which is exactly the outcome the patient was trying to avoid by not mentioning it.

A medication left off the form is the single most likely route to a complication in an otherwise routine third molar case, and it is more common than most patients would guess. Sometimes it is genuine forgetting. Often it is deliberate: a patient wants the tooth dealt with, has taken time off work, has arranged a ride home, and has correctly worked out that a disclosure might move the date. The instinct is understandable and the consequence is not proportionate to it.

The reason it matters so much is that these histories are not discovered during surgery. A suppressed bone turnover shows up at week six, not at minute ten. An anticoagulant declares itself when the pressure comes off the socket in the car. An undisclosed antiplatelet drug does not make the operation harder; it makes the evening harder, at home, without the materials and staff that would have been assembled had anyone known.

There is a second version of the same problem that has nothing to do with concealment. Patients under-report anything that does not feel like medication. Over-the-counter drugs, supplements, injections given elsewhere, medications a specialist started and a general physician never listed, and anything taken on an as-needed basis all go unmentioned routinely. Bringing the actual boxes, or a photograph of your pharmacy list, closes more gaps than any wording on a form ever will.

If something surfaces after the form is submitted, it is not too late and it is not awkward. A history disclosed the day before surgery is worth far more than the same history disclosed at the follow-up appointment, and it is treated as useful information rather than as a problem you created.

The intake answers become part of your clinical record and are used to build the surgical and anaesthetic plan. They are reviewed by the surgeon before the consultation rather than skimmed on the day, which is why the form is sent ahead of time. Answers that carry clinical weight are flagged deterministically by the system rather than being left to a summary, so a bisphosphonate history cannot quietly drop out of a paragraph.

Where an answer requires an opinion from another clinician, correspondence goes out with your consent and the reply is filed with the record. Where an answer changes nothing, it stays on file and changes nothing. The history is not shared with anyone outside the care of your teeth, and it is not used to decide anything other than how to treat you safely.

One point about scope, because patients sometimes assume the opposite: the questions are asked in service of removing third molars and giving anaesthesia, and nothing else. A cardiac history on this form exists to shape an anaesthetic plan. It is not a general health assessment and it does not replace one.