Inclusion Criteria:

- Have an Eastern Cooperative Oncology Group (ECOG) performance status of =< 2

- Patients with no distant metastatic disease

- Have histologically proven diagnosis of squamous cell carcinoma (stage III - IV) of
the paranasal sinuses, nasopharynx, larynx, hypopharynx, oral cavity and/or
oropharynx; treated with definitive concurrent chemoradiotherapy; OR histologically
proven diagnosis of squamous cell carcinoma of the paranasal sinuses, nasopharynx,
larynx, hypopharynx, or oropharynx with finding of need for concurrent
chemoradiotherapy (extracapsular extension, positive surgical margin, more than one
lymph node positive, stage III - IV disease, perineural invasion, vascular tumor
embolus); other rare histologies which are treated as per the guidelines of this
protocol may be allowed with approval of the medical monitor

- Concurrent monochemotherapy with cisplatin

- Radiation therapy to 70 Gray (Gy) to gross tumor in 2 Gy per fraction over 7 weeks
using intensity modulated radiation therapy (IMRT) techniques for patients with
intact tumors, and 60 Gy - 66 Gy in 2 Gy per fraction using IMRT for post-operative
patients

- Induction chemotherapy (with up to 3 cycles of docetaxel and cisplatin based
regimens) is allowed

- Ability to swallow and retain oral medication

- Leukocytes >= 3,000/uL

- Absolute neutrophil count >= 1,500/uL

- Platelets >= 100,000/uL

- Total bilirubin within normal institutional limits

- Aspartate aminotransferase (AST) (serum glutamic oxaloacetic transaminase
[SGOT])/alanine aminotransferase (ALT) (serum glutamic pyruvate transaminase [SGPT])
=< 2.5 x institutional upper limit normal (ULN)

- Calculated creatinine clearance >= 60 mL/min (Cockcroft-Gault equation)

- Patients of child-bearing potential must agree to use adequate contraceptive methods
(e.g., hormonal or barrier method of birth control; abstinence) prior to study entry
and for the duration of study participation; should a woman become pregnant or
suspect she is pregnant while she or her partner is participating in this study, she
should inform her treating physician immediately

- Patient or legal representative must understand the investigational nature of this
study and sign an Independent Ethics Committee/Institutional Review Board approved
written informed consent form prior to receiving any study related procedure

Exclusion Criteria:

- Contraindication to full course chemoradiotherapy

- ECOG performance status >= 3

- Presence of distant metastatic disease

- Surgery with significant defect or flap in the oral cavity

- Poor dentition, ill-fitting dental appliances, obturators or any kind of resection
prosthesis (can be enrolled if this can be corrected by a dentist prior to start of
radiation therapy)

- Presence of other medical conditions causing mucositis (e.g., rheumatologic, severe
gastroesophageal reflux, etc. at the discretion of the physician)

- Previous radiotherapy on head and neck district involving mucosa of oral cavity
and/or oropharynx

- Use of chronic immunosuppressive drugs

- Brachytherapy or interstitial implantation treatment

- Other medical conditions that could make the patient not able to comply with the
treatment

- Requirement of chronic steroid therapy (except when given for laryngeal edema)

- Pregnant or nursing female patients

- Unwilling or unable to follow protocol requirements

- Any condition which in the Investigator's opinion deems the patient an unsuitable
candidate to receive study drug

- Received an investigational agent within 30 days prior to enrollment