Good thing is that there is no cap damage.. Must got removed due to intermittent sticky food.. Caps are fitted on tooth with dental cement by Dentist.

U will not be able to fix the cap on your own. Visit a dentist and he shall fix it on using a suitable cement. Keep your cap safe and sterile probably in a clean box or packet. Do not delay the fixation, it might hamper the fit of the cap and also invite other complications like infection, food lodgement, difficulty in chewing etc.

It's a minor problem, cap is fixed on Ur tooth with a cement 5 year back , Cap faces many forces acid attack alkali attack  in your oral cavity with so many factors sometimes cap may come out So don't worried about it just go to your dentist It's a 10 minutes procedure It's again fixed

caps only get fixed by a luting cement

Hi sir...    The cap may come off due to wear away of luting cement....     Nothing to worry sir..... you can simply refix it with luting cements by dentists

If the cap is not broken it can be fixed back, but you need to visit the dentist for the same. The cap is fixed with help of luting cement under proper isolation.

You can get your cap refixed from a dentist as it is fixed with a dental cement specially made for that purpose