Oh just seen the link, he sure is a sweet thing! Love the different colour
eyes! Very unusual :)

Best wishes with him, and may he have many more years with you :)

Dry food is actually not all that good for teeth.  Megan posted the
following article here back in September, and since I've switched my cat to
a mostly wet food diet.  Dry food is not great for a cat's teeth because: 1,
cats get most of their water intake from the food they eat, and dry food
contains very little - thus their salivation decreases, exacerbating tooth
decay (and also therefore contributes to kidney failure as they are
chronically dehydrated)....and 2. dry food is high in sugar, and as dry food
tends to stick on teeth, is makes the problem all the worse.

here's what it says in the article re: dental disease and dry food

Dental Disease:
Long-standing claims that cats have less dental disease when they are fed
dry food versus canned food are grossly overrated, inaccurate, and are not
supported by recent studies. First, dry food is hard, but brittle, and
merely shatters with little to no abrasive effect on the teeth. Second, the
high carbohydrate (read: sugar) level in dry foods has been shown to cause
dental decay. Third, many cats swallow the majority of their dry food whole
and thus receive minimal benefit from chewing motion. Finally, a meat-based
diet results in an acidic oral environment which may actually prevent some
forms of dental disease. There are many factors that contribute to dental
disease in the cat such as genetics, viruses, and diet. There remain many
unanswered questions concerning the impact of diet on dental health, but
feeding a high starch, species-inappropriate dry diet is a negative factor.

for the whole article

http://www.catsincanada.com/articles/feeding.html

My 12.5 year-old cat's teeth are in good condition, but one thing for sure,
since the switch to mostly wet food, her coat has become so much softer and
shinier!