One of the characteristics of good quality teak wood is its dense pores, so the surface is not perforated. For that, make sure you are observant and avoid buying teak wood that has small holes on its surface.
Teak wood which has dense pores, of course, will be more durable than termite attacks, so the wood will not quickly become porous. The presence of small holes on the surface of the teak wood also indicates that the inside is porous even though the outside looks solid.