For about 2-3 days, i've had a rough area inside my cheek in my mouth. now there is one on the other side. should i worry? worried i have oral cancer?

Don't worry: Rare place for cancer...roughness in the cheek mucosa can occur from nightly clenching and bruxism (teeth grinding) even sometimes leaving a white line. See your dentist to help you figure the right remedy

Not Likely: Cancers do not develop on both sides of the mouth at the same time. It is more likely due to grinding your teeth or a subconscious nervous habit when awake. There are also some benign conditions that can give that "rough " feeling. Have your dentist take a look as it may indicate another (very likely non-cancerous) problem.

See your dentist: Have your dentist check the areas. Possibilities are inclusive of cheek biting which produce a white line and can be bilateral.

Quite common: The cheek biting during sleep has been reported as a common symptom in association with night bruxism. The custom night guard can be designed and fabricated by your dentist to prevent jaw closings during sleep, therefore preventing cheek injury.