Wisdom teeth and pregnancy

In pregnancy there are two sets of warning signs to sort through rather than one, and the dental set is not always the more pressing.

One temperature threshold is used throughout this article — 100.4°F (38°C) — and it sits lower than the figure used for the same dental symptoms outside pregnancy. That is deliberate: a fever in pregnancy is worth acting on for its own reasons as well as the tooth's. A temperature at or above it alongside facial swelling is assessed the same day, and if you cannot be seen the same day, go to an emergency department rather than waiting.

Pain is a poor guide to urgency. Severe pain often accompanies something entirely local, and a spreading infection sometimes hurts less as it spreads, because the pressure that caused the pain has escaped into the surrounding tissue. Swelling tells you where the infection has reached, and that is the question that changes management.

Some patients move up that list because of the pregnancy rather than the tooth. Poorly controlled gestational diabetes, immunosuppression, and any condition already under obstetric review all mean a dental infection is assessed sooner than it otherwise would be. If you are on an injectable anticoagulant, say so at the first opportunity — it changes both the timing of an appointment and how any bleeding is handled.

One more thing carries a clock, for anyone reading this after surgery rather than before it. If any part of your lip, chin or tongue is still numb, tingling or simply different from the other side once the local anaesthetic should have worn off, telephone the office the day you notice it, not at a scheduled review. The reason is set out further down this page.

The question splits in two, and almost every disagreement about it comes from answering one half while thinking about the other. An elective removal is one where the tooth is impacted, silent, and doing no identifiable damage: no infection, no decay on the second molar, no deep pocket behind it, no cyst around the crown. There is no clock on a tooth like that. Deferring it means deferring by months, and the operation afterwards is the same operation, with the same recovery, at a point when a week of restricted diet, analgesia and disturbed sleep does not land in the middle of a pregnancy. That is the whole of the argument for waiting, and it is a good one.

Deferral is a plan, not a dismissal. If you are told a wisdom tooth will be dealt with after the baby, that should arrive with a date, a record of what was found, and an instruction about what would change the plan sooner. "After the baby" with nothing attached to it tends to become eighteen months and a second pregnancy.

The other half of the question is a tooth that is already causing disease. Acute pericoronitis, an abscess, facial swelling, pain that has stopped you eating or sleeping, or decay that has reached the nerve. None of that is elective, and none of it is improved by waiting for delivery. Those are treated when they present. Pregnancy changes how they are treated, what is prescribed, how you are positioned and which images are taken. It does not change whether.

Between the two sits the situation that generates most of the discussion: a partly erupted tooth that has flared more than once, settled each time, and is quiet on the day the question is asked. That is a judgement made on how often the episodes come, how severe they have been, how many weeks you are, and what the obstetric picture looks like. Sometimes the answer is to use the second-trimester window rather than leave a flare to arrive at thirty-six weeks. Sometimes it is to hold with interim measures and reassess. Both are defensible, and the reasoning behind whichever is chosen belongs in the conversation.

When treatment cannot wait until after delivery but is not an emergency, it is generally placed in the middle third of pregnancy — often quoted as somewhere between weeks fourteen and twenty. The reasons are practical rather than mysterious.

The first trimester is when the baby's organs are forming, which sets the threshold for any medication or imaging higher than it will be later. It is also when nausea and vomiting are usually at their worst, and sitting through an appointment with an open mouth is harder than it sounds when you are already struggling to keep water down. And the background rate of miscarriage is at its highest in those weeks, so anything done during them tends to get blamed for an outcome it had nothing to do with. That last point is not a clinical risk, but it is a real one, and it matters more to the person it happens to than any reassurance offered afterwards.

The third trimester brings different constraints. Lying flat on the back drops blood pressure, for reasons described in the section on the appointment itself, which limits how long anyone can be reclined comfortably. Sitting still is harder generally, the bladder tolerates less, and labour becomes a live possibility that nobody wants to meet in a dental chair.

So the middle third is the preference. It is not a rule with a fence around it. An infection at thirty-four weeks is treated at thirty-four weeks, with the plan adjusted and the maternity unit told.

The instinct in pregnancy is to do nothing that is not strictly necessary. For a silent impacted tooth that instinct is correct. For an infected one it inverts, and it is worth being clear about why.

Pericoronitis is inflammation, usually with infection, of the flap of gum lying over a partly erupted tooth. Left to itself an episode may quieten over several days, and it may not. When it does not, the swelling moves outward from the gum into the tissue spaces of the cheek, under the jaw, and towards the floor of the mouth. That progression is the same in pregnancy as outside it, and so is the point at which it becomes a hospital admission.

What changes is that the intermediate stage is worse to be in. Fever, dehydration, several days of not eating properly, sustained pain and broken sleep are all things a pregnancy does not need, quite apart from the infection generating them. The comparison is never between treatment and nothing. It is between treatment now and treatment later under poorer conditions, with the illness in between.

There is a separate body of research on gum disease in pregnancy and its association with preterm birth and low birth weight. The association has been reported repeatedly; trials that treated gum disease during pregnancy have not, on the whole, shown that doing so changes those outcomes. It is worth knowing that literature exists and worth knowing it is unsettled, because the argument for treating an acute dental infection during pregnancy does not rest on it. It rests on the infection.

The professional bodies have been consistent on the general point for years. The American College of Obstetricians and Gynecologists and the American Dental Association both take the position that necessary dental treatment should not be withheld because a patient is pregnant, and that preventive and emergency dental care belong in routine antenatal advice. Facial swelling during pregnancy is assessed the same day. If you cannot get a same-day dental appointment, an urgent care centre or an emergency department is the right destination — not the sofa, and not the morning.

This is the part patients worry about most, and usually the smallest part of the decision.

The rule for dental imaging does not change in pregnancy: a radiograph is taken when the answer to a question changes what happens next, and it is not taken otherwise. What changes is the threshold. A film that would have been routine gets deferred; a film that determines whether a swollen jaw is drained, dressed or operated on gets taken.

The physics is worth stating plainly. The beam is aimed at the jaw and narrowed to it, so the abdomen is not in it. What reaches the uterus is scattered radiation, and it is a very small quantity — well below the exposures at which effects on a pregnancy are described in the literature at all. Digital sensors need less exposure than the film they replaced, and taking one image instead of a full series does more to reduce the dose than anything else in the room.

On shielding: if a leaded apron and a thyroid collar matter to you, say so before the image is taken rather than afterwards. It is a reasonable request. Guidance on abdominal shielding in particular has been revisited in recent years by medical physics bodies, on the grounds that a shield can interfere with automatic exposure control and occasionally forces a repeat image. Whatever position is taken on the apron, the apron is not what makes the exposure small. Collimation, digital sensors and taking fewer films are.

A cone-beam scan is a different proposition from a single film — a three-dimensional study with a larger exposure. It is taken during pregnancy only where the answer changes the operation being done now, which in third molar surgery generally means roots that appear to cross the nerve canal on a panoramic film, in a case that is going ahead. If one is suggested, ask what question it is expected to answer. There is a specific answer in every legitimate case.

One thing not to do: refuse a necessary radiograph and ask for the surgery anyway. Removing an infected lower third molar without knowing where its roots sit relative to the nerve is a considerably larger risk than the film.

Local anaesthetic is the least contentious part of this conversation. The agents used in dentistry have long records of use during pregnancy, and they act where they are injected rather than throughout the body. Being properly numb also matters for a reason beyond comfort: pain during a procedure produces a physiological response of its own, and there is nothing to be gained from enduring it. Some preparations include a vasoconstrictor, which keeps the anaesthetic where it is put and reduces bleeding; which one is used is decided against your history rather than by default, and it is a reasonable thing to ask about.

What is used to keep you comfortable beyond local anaesthetic is agreed at the consultation, and during pregnancy that discussion includes your obstetric team rather than being settled in the dental chair. Some of what would be considered outside pregnancy is not appropriate during it. Where a plan needs something this office does not provide, the referral is made rather than the plan being bent to fit the room.

Antibiotics

An antibiotic is prescribed when there is an infection to treat. It is not a way of postponing treatment of the cause, and a course that settles a flare while the flap and the pocket underneath it remain unchanged usually buys weeks rather than solving anything. Several antibiotic classes that are ordinary outside pregnancy are avoided during it — the tetracyclines are the familiar example, because they affect developing teeth and bone. Any prescription is checked against your medical and obstetric history before it is written, which is another reason the full list belongs at the consultation.

Pain relief

The category most often restricted in pregnancy is the anti-inflammatory pain relievers. Advice has tightened here in recent years: regulators including the US Food and Drug Administration now advise avoiding them from around the twentieth week onwards, on the basis of effects on the baby's kidneys and on the amniotic fluid, and there is a longer-standing reason to avoid them in the final trimester as well. That matters because they are exactly the medicines people reach for on a pharmacy shelf at eleven at night with a swollen jaw.

So settle the pain relief plan in advance and in writing, with your obstetric team's input, rather than improvising on the evening it is needed. Bring your full medication list, including anything bought without a prescription and any supplement, to the consultation. What is written on your own post-operative instructions governs over any timing or choice in a general article, and this article does not attempt to set either.

Measures needing no drug decision still do real work while you wait: warm salt-water rinses allowed to fall out of the mouth, gentle brushing behind the last tooth, chewing on the other side, a cold pack against the cheek.

This is not a formality to be completed after the decision has been made. A dental office does not hold your obstetric picture, and the parts of it that change a surgical plan are frequently not the parts a patient thinks to mention.

What is asked for, and what is worth having ready before you are asked:

• Gestational age in weeks, and the estimated due date. Weeks, not months — the plan changes across a fortnight.
• Whether this is a single pregnancy or more than one.
• Gestational diabetes, raised blood pressure, or pre-eclampsia under review.
• Any threatened preterm labour in this pregnancy, or a previous preterm birth.
• Anticoagulation. Some pregnancies are managed with injectable anticoagulants, and that changes both the timing and the handling of bleeding.
• Placenta praevia, or any instruction you have been given about lying flat, positioning or activity.
• Which unit you are booked at, and the number for its triage line.
• Your maternity hand-held record or notes, if you have been given one.

On the letter itself: a useful one states what treatment has been agreed, any medication restriction, any positioning limit, and who to call if something changes. A letter saying only that the patient is cleared for dental treatment leaves all four unanswered, and they are the four that change what happens on the day. If the short version arrives, it is reasonable to go back and ask.

Some pregnancies are managed in a hospital setting rather than an office, for reasons that have nothing to do with the tooth: a significant cardiac or clotting condition, or a pregnancy already under close obstetric supervision. That is a judgement about the setting, not about the patient, and when it is the right answer the referral is made.

Say when your nausea is least when you book, and ask for a time that fits it rather than taking whatever slot came up first. Eat before you come unless you have been told otherwise; arriving hungry for a long appointment during pregnancy is its own problem. Deal with the bathroom before anything starts rather than halfway through.

Positioning is the part patients are least prepared for. Past the middle of pregnancy the chair is not laid flat, because lying on the back lets the uterus press on the large vein returning blood to the heart. A wedge or a rolled towel under the right hip tilts you to the left and takes that weight off it, and the chair stays more upright than usual. If you feel light-headed, sweaty, short of breath or suddenly nauseated while reclined, say so as you notice it rather than waiting to see whether it passes. The response is to sit you up and roll you onto your left side, and it takes seconds.

The usual approach during pregnancy is a shorter appointment and, where it is possible, staged treatment. Outside pregnancy it is often sensible to remove all four third molars in one sitting. During pregnancy the reasoning runs the other way: treat the tooth that is causing the problem, leave the ones that are not, and reassess the rest after delivery. A shorter operation means less time reclined, less local anaesthetic, less bleeding and a shorter recovery to get through while pregnant.

The first week afterwards follows the ordinary pattern: oozing controlled with firm unbroken pressure on gauze, swelling peaking around day two or three, a soft diet widening from day four, no straws and no vigorous rinsing on the first day. The pregnancy overlay is that the pain relief plan was settled in advance, that a fever gets your obstetric team called as well as the dental office, and that someone is with you for the first day.

Gum tissue responds more strongly to the same amount of plaque during pregnancy. Gums bleed more readily when brushed, feel spongier, and a flap over a partly erupted tooth that has been quiet for years sometimes becomes symptomatic for the first time. Bleeding on brushing is a reason to brush that area more carefully and more often, not to leave it alone, and it is one of the things most commonly got backwards. Routine cleanings with a general dentist are not deferred because of pregnancy.

The area behind the last standing tooth is where technique matters. A small-headed soft brush angled behind the second molar, or a single-tufted brush, reaches a surface an ordinary brush head skates past. Warm salt-water rinses held over that side after meals do more than a quick swill. Neither changes the position of the tooth, and neither is claimed to — the aim is to keep the bacterial load down in a pocket that cannot be cleaned properly, for as long as it has to stay there.

A soft red lump that appears on the gum during pregnancy, often bleeding easily when it is brushed, is a recognised pregnancy finding that commonly regresses after delivery. Have it looked at by your general dentist rather than assumed either way; soft-tissue lesions are assessed and managed there, not in a practice whose scope is third molars. It is usually not what people fear.

If you are being sick regularly, rinse with water afterwards and wait before brushing, because brushing enamel that has just been softened by stomach acid does more damage than leaving it for half an hour.

Where an upper wisdom tooth is repeatedly biting into the swollen flap below it, removing the upper tooth is sometimes offered as an interim measure. It is a smaller operation than the lower one and it can settle a recurring flare. Worth asking about if the lower tooth is being deferred.

Fix the reassessment point before you leave. Six to twelve weeks after delivery is a common one, chosen because the immediate postnatal weeks are already full. Put it in a calendar rather than a memory.

This question gets asked less often than the pregnancy one and causes just as much anxiety — often at the point where a mother has quietly decided to postpone surgery indefinitely rather than ask it.

The general position is that you do not need to wean in order to have a wisdom tooth removed. Most medication used around a dental extraction transfers into milk in very small quantities, and the plan is confirmed against your own medication list and your baby's age rather than assumed from a general rule. Local anaesthetic on its own does not, on the usual accounts, require feeds to be interrupted — but confirm that for your own case at the consultation rather than on the strength of a paragraph.

The restrictions are not the same as the pregnancy ones, which is worth saying because people carry the pregnancy list across. Some categories avoided in late pregnancy become acceptable while feeding. Working the other way, the weaker opioid pain relievers get more attention while breastfeeding, because individuals metabolise them at very different rates and an unusually fast metaboliser can pass on more than expected. That is a conversation to have before the prescription is written, not after.

Practically: feed or express immediately before the appointment, so the interval afterwards is as long as possible. If you would rather not feed for a defined period after a particular medication, express and store enough for it beforehand. Bring an adult who can hold and settle the baby — the room the surgery happens in is not a room a baby should be in, and a waiting area is not a place to leave one unattended.

If discarding milk is recommended to you, ask which medication it is for and for how long. An interval with a number attached is something you can plan around. An open-ended instruction to pump and discard is worth going back and asking about, because for most of what is used around an extraction a specific answer exists.

The feeding question and the surgical question are separate, and answering the first does not settle the second. A quiet impacted tooth deferred through a pregnancy still gets reassessed on a set date, and removed if the reasons for removing it still stand.