Use one possessive adjective and the correct form of the verb ser to describe a product you
use to get ready

 Éste es mi dentífrico favorito, lo uso cada mañana antes de salir de casa.

Explanation:

Possessive adjectives are those that modify the noun by adding an idea of belonging or possession.

Possessive adjectives coincide in number and gender with the name of the thing owned and not with the owner or possessor. When the adjectives mío, mía; tuyo, tuya, suyo suya and its plurals are prepended to the name, they suffer apocope, which means that they lose one or more letters of the ending.

These are the possesive adjective in spanish:

Singular:

1st person:

mi, mío, mis, míos                          

2nd person:

tu, su, tuyo, tus, sus, tuyos, suyos

3rd person:

su, sus

Plural:

1st person:

nuestro, nuestra, nuestros, nuestras

2nd person:

su, vuestro, vuestra, sus, vuestros, vuestras

3rd person:

su, sus

answer is a: las

explanation:

the reason for this answer is becouse it's a plural frase which talks more then one thing