Using an expired condom can put both partners in a great danger. Therefore, before rushing to put it on, make sure that it is still within the recommended period of use.
Using your teeth to tear apart the condom wrapper can easily cause damage. This can leave you exposed to the risks of having unprotected sex. The best way to open the sachet is using your hands.
There is always a proper way to wear a condom and if you are not sure, check the instructions on the pack.