back Stacey
Lovely pics of the gorgeous Spirit, the cuddling his toy one is extra cute
When you say 'extra teeth' do you mean like this pic? Riley had extra teeth when he was teething (he was about 5 1/2 months old) - they just dropped out as the adult ones grew and didn't cause him any problems.
I would think that if his gums are sore (as is normal in teething) that the specially designed 'dental' food wouldn't be any good for him as they are larger pieces and are designed to shatter on impact to prevent build up on the teeth, which Shadow won't have at such a young age anyway.
I'd be inclined to stick to what he's happy with at this stage and if there are issues further down the line with his teeth to look into different foods then.