As suggedted see a dentist, preferably one with oncology experience, to correct any oral defects, and be fitted with a fluoride tray. If any teeth are extracted, the minimum healing time is two weeks before starting your treatments, and will probably need their clearance. You may also want to ask about custom radiation mouth guards, and bite stick, to reduce scatter radiation, and is used during your radiation treatment, which helps protect the teeth, and help reduce Mucocitis. If any teeth need to be extracted after treatment, you may need HBO treatments before (20) and after the extraction (10) to help prevent jaw necrosis.

Some general suggestions to prevent tooth decay, and maintain proper oral health since both arecrelated is to clean your teeth after each meal and at bedtime with a gentle tooth brush, some use infant type or sponge type with a prescription strength toothpaste. I used biotene products...dry mouth toothpaste, rinse and gel at night. Use floss, or use irrigator at low setting. Before bed rinse mouth with alcohol free mouth was to reduce bacteria and inflammation. Rinse mouth often with salt, baking soda rinse. Chew xylitol gum to help precent cavities. Sip water throughout the day, and use sugar free drinks, hard candies used to stimulaye saliva? I also use organic virgin coconut oil to swish in mouth for 20 seconds and swallow. It's supposed to be very good for the mouth care. A common product used during treatment is a "Magic Mouthwash" type rinse used to treatment many ailments.

Besides radiation, chemo causes mouth issues too like Mucocitis, and other infections from lowered immune system, and the same oral care will help reduce these risks, but some times prescription medications are needed to treat bacterial or viral infection, all of which has an effect on proper oral health too.

As you go along, you will find what adverse effects you have, some not discussed, more than others, and what is helpful. Everyone is different.

Good luck with everything.