Gap between crown and gumline?

I have a new dental implant and crown on tooth 13. Feels like a large gap behind the tooth where the top of the crown is supposed to meet my gum. Dentist says this is for hygiene purposes, but too much food gets trapped which is extremely annoying. Water pik helps but I wasn't planning on spending rest of my life tied to a water pik. Further, I've read the food that gets trapped can decay and, over time, cause gum and bone loss thereby causing the implant to fail. I appreciate any insight.