Hello firstly white patches can be due to various reasons.if you have habit of smoking or alcohol consumption it can be leukoplakia which is a non cancerous lesion but should be monitored closely for any cancerous changes.
It can also be a fungal infection like candidiasis which require antifungal treatment.
Sometimes it can be inflammatory condition like oral lichen planus and needs treatment.
Next Steps
consult nearest dentist for proper diagnosis.
Health Tips
mouthwashes, gels, or pain relievers can help manage symptoms.