Types of Artificial Saliva
Artificial saliva is commercially available in three main formulations: oral sprays, gels, and rinses, with the ideal preparation containing neutral pH, fluoride, and electrolytes that mimic natural saliva composition. 1
Primary Formulation Types
By Delivery System
The evidence-based guideline literature identifies artificial saliva substitutes by their physical form 1:
- Oral sprays - Most convenient for frequent application throughout the day
- Gels - Provide longer-lasting adherence to oral mucosa
- Rinses - Offer broader coverage of oral surfaces
By Active Ingredient Base
Research studies reveal that artificial saliva products are formulated with different base compounds that determine their lubricating properties 2, 3:
Mucin-Based Formulations
- Contain porcine gastric mucin or similar mucoproteins
- Demonstrate superior lubrication properties by adsorbing onto salivary conditioning films 2
- Historically shown to provide greater patient benefit in xerostomia compared to other bases 3
- Examples include mucin sprays that modify existing salivary films 2
Carboxymethylcellulose (CMC)-Based Formulations
- Use cellulose derivatives as viscosity agents
- Commonly available as carmellose sprays
- May be rated lower by patients despite clinical efficacy 4
- Can enhance oral lubrication when properly formulated 2
Polymer-Based Formulations
Products containing 2:
- Carrageenan - Seaweed-derived polysaccharide
- Xanthan gum - Bacterial polysaccharide
- Carbomer - Synthetic polymer
- Poloxamer 407 - Block copolymer (though it decreases surface tension) 5
Combination Formulations
- Mucin with guar gum - Increases viscosity and viscoelasticity 5
- Methylcellulose or hyaluronate-based - Mentioned in context of artificial tears but applicable to oral formulations 1
Clinical Selection Algorithm
The choice of artificial saliva type should be based on residual salivary gland function 1:
For Patients with NO Salivary Output
- Saliva substitution is the preferred therapeutic approach 1
- Start with mucin-based formulations as they most closely mimic natural saliva properties 5, 2
- Consider gels for nighttime use due to longer adherence
- Use sprays for daytime convenience and frequent reapplication
For Patients with Mild-to-Moderate Dysfunction
- Saliva substitutes serve as adjunctive therapy
- Non-pharmacological stimulants (sugar-free gum, lozenges) should be tried first 1
- Substitutes can supplement when stimulation is insufficient
Key Performance Characteristics
The most effective artificial saliva formulations demonstrate 2:
- Ability to adsorb onto existing salivary conditioning films
- Modification of secondary salivary conditioning film structure
- Enhanced oral lubrication compared to water alone
Only products containing carrageenan, carboxymethylcellulose, pig gastric mucin, xanthan gum, or carbomer have shown superior lubrication enhancement 2.
Important Clinical Considerations
Individual Variation is Substantial
Despite objective measurements showing similar efficacy across products, patients show marked individual preferences 4. The 2005 crossover study found that while a gel was objectively rated best, most patients preferred a carmellose spray due to taste and ease of use 4.
Practical Recommendation
Provide patients with multiple different formulations for trial periods 4. This patient-centered approach allows identification of the individually most acceptable product, which directly impacts adherence and symptom relief.
Ideal Product Characteristics 1
- Neutral pH
- Contains fluoride (for dental protection)
- Contains electrolytes mimicking natural saliva
- Appropriate viscosity for patient comfort
Safety Profile
Modern artificial saliva formulations demonstrate excellent safety, with studies showing no cytotoxicity on normal gingival fibroblasts 6 and consistent symptom relief without significant adverse effects 7, 4.
Common Pitfall to Avoid
Do not select artificial saliva based solely on subjective patient complaints of dryness. The therapeutic approach must be driven by objective measurement of salivary gland function (whole salivary flow rates), as subjective feelings often do not correlate with actual glandular function 1. Environmental and psychological stressing factors can amplify subjective dryness despite adequate objective salivary output.