Clinical decision-support only. For use by licensed dental professionals. Not a substitute for professional judgment or a complete drug reference. Always verify with primary sources.
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Medication

Minocycline

Antibiotic (tetracycline)

Brand names: Minocin, Arestin (local)

Oral health effects

  • Mucosal / bone / tooth pigmentation

    Long-term minocycline can cause blue-gray pigmentation of the oral mucosa, alveolar bone (seen through the gingiva), and even adult teeth. Locally delivered minocycline is used as a periodontal adjunct.

    Mechanism: Deposition of drug-pigment complexes in tissue.

    Clinical management: Reassure; document; discoloration may be slow to fade. Note local-delivery formulation for periodontal pockets.

  • Permanent developmental tooth discoloration and enamel hypoplasia

    Use during tooth development (second and third trimesters of pregnancy, infancy and childhood up to age 8) can cause permanent yellow-gray-brown discoloration and enamel hypoplasia. The risk is higher with long-term use but has been seen after repeated short courses. This is a label Warning.

    Clinical management: In children and pregnant patients, ask about past tetracycline-class exposure when you see banded intrinsic stain or hypoplastic enamel. Hypoplastic enamel is caries-prone, so emphasize fluoride and sealants. Discuss esthetic options with the dentist.

Sources

  1. Adverse drug events in the oral cavity. Yuan A, Woo SB. Oral surgery, oral medicine, oral pathology and oral radiology, 2015.
  2. Minocycline hydrochloride prescribing information (FDA label) PD-Rx Pharmaceuticals, Inc. / DailyMed, 2026.