Pregnancy Gingivitis
On this page
Direct answer
Pregnancy gingivitis is plaque inflammation amplified by pregnancy hormones: rising oestrogen and progesterone increase vascular permeability and oedema, and Prevotella intermedia flourishes using these steroids as substitute growth factors, so mildly inflamed gingiva becomes red, swollen, friable and dramatically bleeding from the second month, peaking in the second to early third trimester, resolving after delivery. Prevalence is quoted from a third to three-quarters of pregnancies, depending on baseline plaque and study definitions. A localised overgrowth on an interdental papilla — the pregnancy tumour, pyogenic granuloma or epulis gravidarum — appears in a small minority; most regress postpartum, and excision during pregnancy is reserved for lesions that bleed uncontrollably, interfere with occlusion or fail to regress. Dental treatment follows trimester logic: urgent care any time, elective care safest in the second trimester.
What you must remember
- The mechanism in one chain: plaque (the cause) plus progesterone-driven vascular permeability, oedema and altered collagen metabolism, plus Prevotella intermedia proliferating on the hormones — hormone-amplified, never hormone-caused.
- Timeline: begins from the second or third month, peaks in the second to early third trimester, resolves substantially after delivery — but only if plaque control is fixed.
- Clinical picture: oedematous, smooth, shiny, deep-red gingiva that bleeds spontaneously or with the lightest provocation, most marked interdentally; painless apart from bleeding.
- Pregnancy tumour (pyogenic granuloma): a rapidly growing, red-to-purple, pedunculated or sessile papillary mass in up to about 5 per cent of pregnancies; most regress postpartum, with excision reserved for bleeding, occlusal interference or persistence.
- Trimester rules for treatment: first — emergency care only, avoiding drugs and radiographs; second — the safe window for debridement and restorative care; third — brief appointments, semi-supine with slight left tilt to avoid aortocaval compression.
- Safe and unsafe drugs: paracetamol the analgesic of choice, penicillins the antibiotics; tetracyclines contraindicated (tooth discolouration), metronidazole traditionally avoided in the first trimester unless physician-approved; local anaesthesia with adrenaline in dental doses is acceptable.
- Periodontal therapy is safe and needed: scaling in pregnancy does not harm the foetus, and untreated inflammation is the greater concern — a message worth writing in exams.
- Morning sickness addendum: gastric acid erosion from vomiting — rinse with water or sodium bicarbonate solution and delay brushing 30 minutes.
Managing gingivitis across the trimesters
A woman in her fourteenth week has gums that "bleed every time I brush" and an angry purple lump on the papilla between her upper canine and premolar, growing for a month. The timing is fortunate — the second trimester is the treatment window. Record the obstetric history, delivery date and physician contact, then treat the cause: full-mouth scaling under good suction, with a disclosed demonstration of interdental brushing; reassure her that cleaning is safe for the baby and bleeding will reduce over weeks. The pyogenic granuloma gets plaque control and review rather than a scalpel — most regress postpartum, and excision mid-pregnancy invites regrowth — but teach her to clean beneath its edge and warn that heavy bleeding brings her straight back. Schedule restorative work this trimester, keep later appointments short with a slight left tilt, and set a third-trimester recall. At the postpartum visit, the gingivitis should have faded; a residual tumour that persists and troubles her is excised now — unhurried, with a stable hormonal background.
Trimester rules
Examiners test whether timing is reasoning rather than superstition. The first trimester carries organogenesis — emergency-only care and drug minimisation; the second, with completed organogenesis and a manageable abdomen, is the elective window; the third brings supine hypotension risk — short, semi-upright appointments with left tilt, avoiding routine procedures in the final weeks. The drug question: tetracycline is the classic contraindication, paracetamol the standard analgesic, penicillin the standard antibiotic, metronidazole approached with caution early in pregnancy. Two clinical fallacies deserve rehearsed refutations: that dental treatment harms the foetus (needed care is safe — the second trimester exists to deliver it) and that the pregnancy tumour must be excised at diagnosis (most regress postpartum; restraint is the examined answer). Finally, whether treating periodontitis improves pregnancy outcomes — the honest answer notes plausible mechanisms and mixed trial results: association with adverse outcomes, not proven causation.
Frequently asked questions
Why does gingivitis worsen during pregnancy?
Raised oestrogen and progesterone increase vascular permeability and oedema and alter connective metabolism, while Prevotella intermedia uses the hormones as growth factors — amplifying plaque-driven inflammation.
What is a pregnancy tumour and how is it managed?
A pyogenic granuloma — a red, bleed-prone papillary overgrowth in a minority of pregnancies — managed with plaque control and review, since most regress postpartum; excision is reserved for uncontrollable bleeding, occlusal interference or persistence.
Which trimester is safest for elective dental treatment?
The second trimester — after organogenesis, before the supine hypotension of late pregnancy; emergencies are managed whenever they arise with physician coordination.
Which drugs are avoided in pregnancy dentistry?
Tetracyclines (tooth discolouration), strong analgesics beyond paracetamol, and metronidazole by tradition in early pregnancy unless physician-approved; penicillins and paracetamol are the standard choices.
How is dental seating managed in the third trimester?
Short appointments, semi-reclined with a slight left lateral tilt to relieve aortocaval compression, and permission for position changes — preventing supine hypotension and syncope.