What is silver diamine fluoride?

Silver diamine fluoride, commonly abbreviated as SDF, is a clear topical liquid containing silver, fluoride, and ammonia. It is applied directly to a tooth by a registered dental practitioner—not used as a mouthwash or home treatment.

Dentists may consider SDF as part of a broader tooth-decay management plan. It is most commonly discussed for arresting active decay in certain situations, including some cavities in children’s primary teeth and root-surface decay in older adults.

ApplicationPainted onto the affected tooth by a dental professional
PurposeMay help arrest or manage certain active decay lesions
Common concentration38% SDF solution
Important limitationDecayed areas treated with SDF typically turn black
Key point: SDF is not a substitute for a full dental assessment. Whether it is appropriate depends on the size and location of the lesion, the tooth involved, cavity risk, symptoms, and the patient’s preferences.

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How dentists use SDF

A dental practitioner will first examine the tooth and determine whether SDF is suitable. If it is, the tooth is usually isolated and dried, and a small amount of SDF is applied to the affected area with a microbrush.

The procedure is generally quick and non-invasive. Depending on the clinical situation, a dentist may reapply SDF at a later review appointment or recommend a further restorative treatment.

Questions worth asking your dentist

  • Is SDF appropriate for this particular tooth and lesion?
  • Will the treated area become permanently dark?
  • What are the alternatives, including a filling, sealant, fluoride varnish, or monitoring?
  • Will follow-up treatment be needed?
  • What are the likely costs and whether private health insurance may contribute?

Potential benefits and limitations

Research reviews have found that SDF can be effective for arresting coronal caries in primary teeth and for preventing or arresting root caries. Evidence is stronger for some uses than others, and clinical suitability varies from person to person.

Potential benefits

  • Non-invasive and usually quick to apply.
  • May help arrest certain active decay lesions.
  • Can be useful where conventional treatment is difficult, delayed, or not immediately preferred.
  • May be considered for some children, older adults, or people with special needs, following professional assessment.

Limitations and considerations

  • It does not restore missing tooth structure in the way a filling or crown can.
  • Treated decayed tooth structure commonly becomes permanently black.
  • It is not suitable for every cavity or every patient.
  • Ongoing prevention—such as brushing with fluoride toothpaste, reducing frequent sugar exposure, and regular dental review—remains important.
Cosmetic consideration: The dark staining of treated decayed areas is expected with SDF and is often permanent. Discuss appearance and alternative treatments with your dentist before treatment.

Frequently asked questions

Is silver diamine fluoride a filling?

No. SDF is a topical liquid applied to a tooth. It may help arrest certain decay lesions, but it does not rebuild lost tooth structure like a conventional filling.

Can I buy SDF and apply it myself?

SDF should be applied by an appropriately qualified dental professional. Do not attempt to apply dental medicaments at home without professional advice.

Does SDF hurt?

Application is generally non-invasive and does not involve drilling. Your dentist can explain what to expect for your specific situation.

Why does SDF make teeth black?

Silver reacts with decayed tooth structure, commonly causing a permanent dark or black appearance in the treated area. Healthy tooth structure may not darken in the same way, but this should be discussed before treatment.

Is SDF suitable for all cavities?

No. Suitability depends on factors including the depth and location of decay, symptoms, tooth type, infection or pulp involvement, and the patient’s overall dental treatment plan.

References and further reading

  • American Dental Association — Silver Diamine Fluoride: Oral Health Topics.
  • Systematic reviews on SDF for managing carious lesions, including evidence on coronal and root caries.
  • Australian Therapeutic Goods Administration — advertising requirements for therapeutic goods.
  • Australian Health Practitioner Regulation Agency — guidelines for advertising regulated health services.

This page is general information only and is not a substitute for personalised dental advice. Treatment decisions should be made with a registered dental practitioner.