These kits are great to have in emergencies! I really think we are entering a time where dental care is becoming increasingly more inaccessible and expensive! The difference between these and filling kits from the pharmacy is these don’t JUST fill and buy time. They may actually help rebuild and restore teeth and eliminate cavities! Obviously this is a theory and hasn’t been tested, but with what I understand about hydroxyapatite and how it interacts with teeth, I think there is promising evidence to support my thoughts!! 
I’ve been buying time with a pretty big cavity in my tooth for a few months now.
The mastic gum filling seals composite packing material in the cavity that effectively helps rebuild and strengthen teeth while also killing cavity causing bacteria in the mouth and preventing food and bacteria from entering the carie… Relieves pain and inflammation as well!!
Just look at these results after applying our fillings to a cavities!!
Applied Cavity treatment drops
Packed with Composite Filling Material
Inserted Temporary Mastic Gum Filling