This script will get any current requests with missing indexes.
Execute the script to list the requests with missing indexes. If the script returns any records, investigate the cost of the query by looking at reads, logical reads, writes, row count, cpu time and total elapsed time to see if the query affects the performance. Look at the query plan to see the details of the index.
Before you implement any index, make sure there are no index you can improve to cover this missing index suggestion and test in your test environment