Hello! I have a 2.5 year old indoor cat. At his last check-up the vet showed me that he has red gums and suggested a mouthwash-type liquid (DentiCan) that I apply every day with my fingers (it’s really a spray but I’ve found that dipping my fingers in the liquid and running them over his gums is the only way to apply the product.) I haven’t really noticed any improvement. Is there anything else I can do prevention wise? What might be causing this issue in the first place? None of our other cats have gum issues and they all eat a high quality Hills diet. Thanks for your input!