Self-increment Identity (1, 1) is fast, do not change the type of field type, how to solve

Assuming that the self-increment is 65535, it has now arrived, and the 500,000 records before, can you use these empty ID numbers?

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DBCC CHECKIDENT (Table, Reseed, 0);

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Talent in the afternoon: DBCC Checkident (yourtable, reseed, 0)

Number starts from the new