A DWI is classified as at least a Class B misdemeanor. With a DWI, or any Class B misdemeanor (or higher) conviction, you will be ineligible for a CHL for at least five years. If you currently are a holder of a concealed handgun license, you will soon get a letter from the Texas Department of Public Safety notifying you that you license is suspended due to arrest.
If your DWI is negotiated to a non-DWI charge that results in deferred adjudication, you will still be ineligible for five years. The deferred judgment is treated as a conviction for purposes of CHL licensing. The only way to prevent your concealed handgun license from being revoked is to get a dismissal or a not guilty at trial.
If you have been convicted of two or more alcohol or drug related offenses within the last 10 years, you may not be eligible for a CHL at all.
Does this prevent you from using a firearm? No. Assault – Family Violence convictions will, however, prevent you from owning a firearm indefinitely.