regarding a domain name, hyphen or no hyphen

[dhaliwal]

I am planning to register 10 new domains and i am bit confused if i should be using the nice domain with hyphen or should go in for a longer name without any hyphens.

the sites are abt hair loss and skin care.

so was thinking hair-loss-treatments.net

but am not sure if they have issues with ranking on SE

please comment.

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