I have a hole in the backside of my right incisor. Is filling it possible or would a crown be necessary? (Photo)

Agree with other dentist here...You have a cavity and appears you have more than one. They just have not broken thru yet..Fillings will most probably work but don't wait any longer.

Hi:The depth of the cavity is not very apparent.  It however appears you should be able to fix with a simple filling.  Best to have an X-ray taken first.Best,Dr. Maddahi

Thanks for sending over your photo.  That hole is actually a cavity and from the photo you have sent you have lots of them between your teeth.  I would seek care from a dentist and get the cavities removed.  You should only need fillings at this point, not crowns but do not continue to hold off on treatment as it will only get worse.