Dentist said I need to see an ENT doc prior to dental implants. Why?

HI:
Most likely the dentist wants to make sure the sinus are clear and it will not pose any problem in terms of sinus lift.  This is not a bad idea.
Best,
Dr. Maddahi

if you need implants, and you do not want to involve the sinuses or bonegrafts , there is a protocol,that can help you a lot and its one of the must advanced treatments that you can find in the market, and its called the ALLON4,this can be your great solution.