This Halacha is an excerpt from our Sefer

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The law:

All non-edible products that contain disintegrated Chametz may be owned and benefited from throughout Pesach. This applies even if the product is edible for a dog. It however may not be eaten, even if inedible for dogs. Thus, one may own and benefit from cosmetics, shoe polish, soap, shampoo, gas, deodorant, and anything of the like even if they contain a Chametz ingredient.

See here for the full details of the above law

Q&A on products of the mouth

Does lip stick need a Hashgacha for Pesach?

From the letter of the law, it is permitted to be used even if it contains a Chametz ingredient.[1] Nevertheless, many are stringent in this matter, including those who are normally lenient in using non-Kosher for Pesach products on their skin.

Does chap stick need a Hashgacha for Pesach?

From the letter of the law, it is permitted to be used even if it contains a Chametz ingredient.[2] Nevertheless, many are stringent in this matter, including those who are normally lenient in using non-Kosher for Pesach products on their skin.

Vaseline:

Vaseline made of 100% petroleum jelly does not contain Chametz and may be used on the lips.

Does toothpaste or mouthwash need a Hashgacha for Pesach?[3]

From the letter of the law, unflavored toothpaste and mouthwash are permitted to be used without a Hechsher, just as is the law during the year.[4] Nevertheless, many are stringent in this matter, including those who are normally lenient in using non-Kosher for Pesach products on their skin. This especially applies towards flavored toothpastes and mouthwashes, in which case they may require a Hechsher from the letter of the law.[5]

May one lick the back of stamps and envelopes which have a suspicion of containing Chametz ingredients on its adhesive part?

Some Poskim[6] write against doing so as their glue may contain Chametz.[7]

Does Dental floss require a Hashgacha for Pesach?[8]

No, unless it is flavored.

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[1] As a) It is not edible even for dogs. [Petroleum, which is an active ingredient in wax and lip stick, is poisonous for dogs, and is unhealthy for human consumption] and therefore b) Even if one swallows some of it, since he had no intent to do so, he has not transgressed. [Admur 442:34 regarding ink that contains Chametz]

[2] As a) It is not edible even for dogs. [Petroleum, which is an active ingredient in wax and chap stick, is poisonous for dogs, and is unhealthy for human consumption] and therefore b) Even if one swallows some of it, since he had no intent to do so, he has not transgressed. [Admur 442:34 regarding ink that contains Chametz]

[3] See Kaneh Bosem 125; Piskeiy Teshuvos 442:10; Madrich of Eida Hachareidis

[4] As a) It is not edible even for dogs. And therefore b) Even if one swallows some of it, since he had no intent to do so, he has not transgressed. [Admur 442:34 regarding ink that contains Chametz] Now, although in this case one is intentionally placing the product in his mouth, nonetheless, as proven from the source of Admur in the Terumos Hadeshen, it is nevertheless allowed as he has no intent to benefit from it. [Kaneh Bosem ibid]

[5] If the flavoring contains Chametz, perhaps we would apply the concept of Achshavei towards tasting it, and it is forbidden to even taste an Issur. [Kaneh Bosem ibid]

[6] Teshuvos Vehahagos 225

[7] However, based on Admur 442:32-34, that the prohibition is only to intentionally consume the inedible product, one should be allowed to lick the stamps if they contain inedible Chametz.

[8] Madrich of Eida Hachareidis