dentist said i had extra bone or uncommon growth in upper jaw?

i went to have a molar removed the other day and in the x-ray my upper jaw right above my teeth the dentist said i had an unusual amount of bone or bone density i can't remember exactly, he didn't say it was a bad thing but i've had it all my life i guess, i fell no discomfort or pain, i dont' grind my teeth so anyone know what this could be? if i had an x-ray i'd share but i'm not sure what to think of what he told me cause he for some reason had to mention it even though it was nowhere near the problem tooth