Most Dominican salons are known for their "Dominican blowout" which produces silky smooth, straight hair using tension and heat from a blow dryer and flat iron. Even though many salons use this technique without harsh chemicals, the extended high heat and tension on the hair can be quite harmful to black hair over time.
A Dominican blowout typically lasts 1 to 3 weeks and may be OK for black hair on occasion. For a more long-term strategy, ask the salon for a style that uses low heat, minimal tension, and natural ingredients.