Twitch ate strictly dry food for years. Did her no good, she lost all her teeth. She's now 5 & was 2 when they all came out. She'd eaten nothing but dry food....not one bite of canned...and still lost all her teeth.
Have you talked to your vet? Mine does not suggest dry food for dental health, he says the difference between canned & dry diets are little to none when it comes to teeth cleaning.