Please choose the correct ending to complete the given sentence: Youth: [header] How to clear blackheads with toothpaste [title] Select the proper type of toothpaste. [step] You will need to ensure you use only the proper type of toothpaste. It needs to be the white paste kind, and not the gel kind.

Ending1: It must also not contain any ingredients that may irritate the blackheads. As of 2012, toothpaste containing a whitening agent, such as orange peel, was classified as a gel toothpaste. Ending2: Toothpaste with a white paste in it is usually advised for people with oily skin and acne due to the breakdown of the blackheads and bacteria found in the white paste. This paste needs to be concentrated so that you can clear blackheads quickly. Ending3: It should also be the plainest type of toothpaste available, not the whitening or sensitivity kind. A mint-flavoured toothpaste is also helpful. Ending4: The toothpaste tends to be thicker and firmer than the other gels, making it less likely to have blackheads on it. [substeps] For the alpha alpha alpha mole, use a non-comedogenic toothpaste meant for use on your skincare.

Answer format: ending1/ending2/ending3/ending4