Welcome Coco. There are many types of magic mouthwashes depending on the pharmacy, and mostly include a mixture of compounds, some which can be made with OTC meds, except for the prescriptions, that can include Benadryl, antiseptic, maalox, mylanta, kaopectate, pain reliever, lidocaine. The typical blend of measurements may be posted here, if you search or ask the pharmacist, but some have good results with MuGuard, but I never used it. It's not too late, radiation continue working 6 weeks post treatment, and some ailments persist for several months, and longer like dry mouth.

Mucositus can be exasperated by spicy, acidic and sharp textured foods, dry mouth, dry air. So avoiding these foods, treating dry mouth, and using a humidifier may help relieve symptoms. Opioids may relieve the pain, but some may need to treat the neuropathic pain.

There are a number of measures to treat dry mouth, exorostemia, with rinses, I use biotene dry mouth toothpaste, rinse, gum, gel. There are othet lozenges, salivary substitutes, some stone stone fruit puts, citric fruit, water, milk that help stimulate or replicate saliva.

Some use prescription pilocarpine to stimulate salivary flow, or Amifostine administered 30 minutes prior to radiation to protect the salivary gland during radiation, with mixed results, and have found the injection has lesser toxic side effects than with IV.

Good luck.