Prescription-strength fluorides should be used because nonprescription fluoride preparations are inadequate for moderate to high risk of dental caries. If drinking water does not contain enough fluoride to prevent dental decay, oral fluoride (e.g., drops or vitamins) should be provided.
Use of topical fluoride has demonstrable benefit in minimizing caries formation. During radiation treatment, it has been recommended that mouth guards be filled with topical 1% sodium fluoride gel and placed over the upper and lower teeth. The appliances should remain in place for 5 minutes, after which the patient should not eat or drink for 30 minutes.
- Fluoride and calcium/phosphates.
- Topical high-concentration fluorides.
- Children: topical and systemic.
- Adults: topical.
Management of xerostomia
Prevention of salivary gland hypofunction and xerostomia
To prevent or reduce the extent of salivary gland hypofunction and xerostomia, parotid-sparing intensity-modulated radiation therapy (IMRT) is recommended as a standard approach in head and neck cancer (HNC), if oncologically feasible. In addition, treatment should focus on approaches to further reduce the radiation dose to the submandibular and minor salivary glands, as these glands are the major contributors to moistening of oral tissues.
Another preventive strategy to reduce radiation-induced salivary gland hypofunction and xerostomia is surgical transfer of one submandibular gland to the submental space not included in the radiation portal in selected oropharyngeal and hypopharyngeal/laryngeal cancer patients.;[Level of evidence: I]
Amifostine is an organic thiophosphate approved for the protection of normal tissues against the harmful effects of radiation or chemotherapy, including reduction of acute or late xerostomia in patients with HNC. Studies have reported varying degrees of effectiveness.[12,13][Level of evidence: I] One randomized prospective study reported that intravenous amifostine administered during head and neck radiation therapy reduces the severity and duration of xerostomia 2 years after amifostine treatment, without apparent compromise of locoregional tumor control rates, progression-free survival, or overall patient survival.[Level of evidence: I] The intravenous administration of amifostine may cause severe adverse effects such as hypotension, vomiting, nausea, and allergic reaction. These adverse effects might be reduced by subcutaneous administration of amifostine. The possible risk of tumor protection by amifostine remains a clinical concern.
Alleviation of xerostomia
Treatment of salivary gland hypofunction and xerostomia induced by radiation therapy is primarily symptomatic. Alleviation of xerostomia includes frequent sipping or spraying of the oral cavity with water, the use of saliva substitutes, or stimulation of saliva production from intact salivary glandular tissues by taste/mastication, pharmacological sialogogues, or acupuncture.
Saliva substitutes or artificial saliva preparations (e.g., oral rinses or gels containing hydroxyethylcellulose, hydroxypropylcellulose, carboxymethylcellulose, polyglycerylmethacrylate, mucin, or xanthan gum) are palliative agents that relieve the discomfort of xerostomia by temporarily wetting the oral mucosa.