ISO 16408:2025

Overview

ISO 16408:2025 - Dentistry - Oral care products - Oral rinses is an international standard that defines physical and chemical requirements, test methods, and labelling/packaging information for non‑prescription oral rinses (mouthwashes). It covers classification, sampling, stability, container compatibility and accompanying information to enhance international understanding and trade. The standard excludes other delivery systems (e.g. mouth sprays, foams, powders) and prescription‑only products.

Key topics and requirements

• Scope and classification
  • Applies to oral rinses (mouthwash/mouth rinse) and classifies products as Type 1 (ready‑for‑use), Type 2 (concentrates to dilute), or Type 3 (solutions for mixing).
• pH
  • Required pH range: 3.0 to 10.5. Non‑fluoridated rinses below pH 5.5 must pass a screening test (ISO 28888). Fluoridated products with low pH may require additional erosion testing.
• Fluoride limits
  • Total fluoride concentration for a Type 1 container: ≤ 1 500 mg/kg.
  • Maximum ionic fluoride per single dispensing: ≤ 120 mg. Test methods include ISO 19448 and validated alternatives.
• Contaminants and safety
  • Unintended heavy metals: total concentration ≤ 20 mg/kg (validated test methods).
  • Microbial contamination: ≤ 100 colony‑forming units per gram; products must be free of pathogens and tested by validated microbiological methods (e.g., ISO and pharmacopoeial references).
  • No readily fermentable carbohydrates allowed.
• Stability, containers and dispensing
  • Products must show no deterioration after stability/ageing tests and containers/dispensing systems must not contaminate the product.
• Accompanying information and packaging
  • Specifies required information on manufacturer’s instructions and on primary/secondary containers (ingredient listing conventions, ethanol statements, usage guidance including “and under adult supervision” where relevant).
• Referenced test methods
  • Integrates numerous standards for testing and evaluation (e.g., ISO 19448, ISO 28888, ISO 11609, ISO 7405, ISO 10993‑1 and various ISO microbiology methods).

Applications and users

• Manufacturers of oral rinses and mouthwashes - product formulation, quality control, labelling and packaging design.
• Analytical and microbiology laboratories - conformity testing and reporting against ISO 16408 test methods and acceptance criteria.
• Quality assurance, regulatory affairs and procurement teams - product specifications, supplier verification and international trade compliance.
• Dental product designers and R&D teams - product safety, stability and consumer information alignment.

Related standards

• ISO 19448 (fluoride analysis), ISO 28888 (erosion screening), ISO 11609 (dosing systems), ISO 7405 and ISO 10993‑1 (biocompatibility), plus relevant pharmacopoeial and USP/Ph.Eur. microbiology and elemental impurity references.

Keywords: ISO 16408:2025, oral rinses standard, mouthwash testing, fluoride limits, pH requirements, microbial contamination, oral care product labelling.