Food issues

Hi my 13 week old ziggy won't eat dry food, I even tried mixing with his wet food but he drops it back when realise.
I know important to have some for his teeth, I need advise please

It's actually a myth that cats need to eat dry food.  Dry food actually doesn't do much, if anything, to improve dental health.  Wet food is preferable to dry food.

If you want to feed your cats something to improve dental health, consider a large dental treat (such as the C.E.T. chews) or raw meaty bones (I don't have any experience--yet!--with this unfortunately).  Or consider purchasing a cat toothbrush/toothpaste kit.

This TCS article is a good read: http://www.thecatsite.com/a/does-dry-food-actually-clean-your-cats-teeth

Good. Don't feed dry food, cats don't need it and the older they get the harder it is to get them off of it.