It sure is nice to look at, but a lot of work! No, the deck is going natural (untreated).
At now $40 a board ft. for teak, You might want to look at a good sealer.
I use a mix of 1/3 Semco goldtone, 1/3 Teak Wonder and 1/3 Thompsons waterseal --- doesnt make the deck slippery when wet. Two coats will last 6 months if you keep the green water off the deck. Only problem with sealers is that they eventually transfer to the soles of your deck shoes and makes them slippery. Occasional sand paper fixes the shoes.