The Naturalization Law (number 1638-44) hasnt been replaced or eliminated by the Dominican Constitution. While it is true that the Government could revoke a naturalization, it can only do it under certain circumstances. For example, if it was obtained through illegal or an irregular process or the naturalized acts against the State, changes their address, or lives in another country for ten years after obtaining the nationality, as mentioned by RepDom.
This part of the naturalization law has not been modified or changed since 1958. You can find the other causes in article 12 and 16 of the law.
https://dgii.gov.do/legislacion/leyesTributarias/Documents/Otras Leyes de Interés/1683.pdf
This is different from a naturalized person renouncing the Dominican nationality before the Executive brach of the Goverment, which the law doesn't prohibits. They could approve it only if he/she has another citizenship or nationality to fall back on as it is forbbiden by international treaties (which the DR is signatary) for a person to be left without a nationality and the protection from a country. The first link Alltimegreat sent applies to people who obtained the nationality by being born in the DR with non-citizen parents (for example legal residents) and enables them to renouce the Dominican nationality and left with the parent's nationality. The other link is confusing because its says that theses countries 'dont allow renouncing of dual citizenship' but it may allude to the first part of this paragraph: you need to have at least one nationality.
On the other hand, the article 23 RepDom mentioned pertains to the loss of the civil duty and rights of a citizen, not the nationality. For example the loss of the ability to vote.