Hi there, I have understood your concern and I will suggest you the best possible treatment options.
As such dental procedures should not have any effect on postponing the periods.
If you both have happened to have unprotected sex activity after 2 nd February then please get her morning's first sample of urine tested for
pregnancy.
In case of any doubt, blood
beta HCG test and USG will be of help.
Even if she is pregnant, she can opt for termination of pregnancy with
abortion pills under medical supervision safely till 9 weeks of pregnancy.
Please seek proper sex counseling, about safe and protected sex activity,this will help to prevent unwanted pregnancy and STDs.
I hope this answer helps you.
Thanks.
Dr. Purushottam Neurgaonkar