However, some degree of ptosis is normal and natural. Some women use the pencil test to determine if their breasts are sagging. Other, more relevant factors when choosing whether to wear a bra include physical support of very large breasts, pain when exercising, and general comfort, as opposed to social pressures such as the desire to present breasts as 'perky' or preventing nipples from being seen through clothing. The theory is that if the girl places a pencil under her breast and if it stays in place, then wearing a bra is recommended if it falls to the ground, a bra is not yet needed. No evidence has been offered as to its validity, but some people consider it a method to determine whether a young girl should begin wearing a bra. The supposition is that breasts that are not pendulous are self-supporting and do not need the added support of a bra. If the pencil does not fall, the woman has 'failed the pencil test' and needs to wear a bra. A pencil stick is placed in the inframammary fold, the point at which the underside of the breasts attach to the chest wall.

Boob pencil animation