Any new acne regimen, including one for blackheads, can take anywhere from 6 to 12 weeks to take effect. If you continue to see new and preexisting blackheads after this time, you may need to make an appointment with your dermatologist. They can use professional tools to extract blackheads.
The Healthline FindCare tool can provide options in your area if you don’t already have a dermatologist. They may even recommend a series of dermabrasion treatments or prescription retinoids to prevent blackheads from coming back.