cancer will not occur all of a sudden , since you arent a smoker and doesnt use tobacco dipps too.. as you have already consuted a dentist
be cool, dont worry.. have healthy vitamin rich diet, take curd, consume more fruits, vegetables. can take b-complex capsule. i hope there will be nothing to worry , be sure you go for the checkup after 2 weeks as per your dentist's recall. he will definitely take care and ease you to normal. have a healthy smile.