How should you use the mouthwash? Biotene Capsule. The oral powder must be mixed with about 1 ounce of water before … Biotene Moisturizing Mouth Spray provides immediate, on-the-go relief from Dry Mouth Symptoms for up to 4 hours. From what age can Biotene first be used? From upwards of 12 years. GENERIC NAME(S): Vitamin A-Vitamin E. Read Reviews (12) Find Lowest Prices. 88 ($0.29/Fl Oz) $14.09 $14.09 Can you water down the mouthwash? Biotene Fresh Mint Moisturizing Oral Rinse Mouthwash, Alcohol-Free, for Dry Mouth, 33.8 ounce 4.7 out of 5 stars 6,592 $9.88 $ 9 . *Evaluated in a 7 day clinical study. Yes, although this may reduce the effectiveness of the mouthwash. Learn how to help your patients with Dry Mouth today! Biotene Dry Mouth Gentle Oral Rinse is specially … The advised directions for use are to rinse in the mouth for 30 seconds, spit out and do not swallow. To use the oral rinse or other liquid saliva substitutes, swish a small amount in your mouth for 30 seconds, then spit out. Does Biotene … Find your Dry Mouth symptom relief with Biotene Dry Mouth Gentle Oral Rinse and enjoy the benefits of long-lasting relief.