Effects of radiation on oral structures depends on various factors :-

1. Source of radiation. 
2. Total amount of radiation.                         
3. Fractionation.                                       
4. Type of filtration.                                  
5. Total area of tissue irradiated.

• Initially mucosa becomes erythematous and atrophic.                 
• Mucositis develops later on necrosis, denudation, ulceration and sloughing of epithelium.                                      
• Pain, discomfort and secondary infections etc occur commonly. 
• Mucositis may extend to large area of oral cavity,nasopharynx,esophagus etc.

• Very often there is loss or alteration of taste sensation due to degeneration of taste buds.                                             
• Pain and discomfort remains for about two weeks.                           
• Mucosa becomes coarse and atrophic after healing in many cases.               
• Use of prosthesis must be completely stopped till complete recovery

Image :- Google website. Writting :- Notes made from Sanjay Kumar Purkait and Mastering bds books