My cat had a period of overgrooming that suddenly came on, but she's a shorthair cat and had no excessive hairball issues. For us it turned out to be a food allergy. So a switch to a higher quality, grain-free food with less ingredients did the trick.
The dry vs wet debate comes up frequently and at the end of the day I would just suggest to do your research and make up your mind. I do agree that wet food is not great for teeth, however I would prefer a cat without teeth over one with CKD or other issues associated with dehydration. But, I too don't want to preach, but I think it would be worthwhile to look into ingredients etc for possible allergens.
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