Final answer:
The appropriate nursing intervention for a client with diabetes who has thick toenails is to provide proper foot care and education.
Step-by-step explanation:
The appropriate nursing intervention for a client with diabetes who has thick toenails is to provide proper foot care and education.
The nurse should encourage the client to regularly trim their toenails to prevent further thickening and complications. The nurse should also emphasize the importance of wearing appropriate footwear and practicing good hygiene to reduce the risk of infections.