No piercing is considered fully healed until it's a year old. Contrary to what you may read, it takes the body a full year to season a piercing to the point where it can be removed for extended periods of time without the risk of the piercing closing.
HBr is polar. The Lewis structure shows a central carbon atom forming four single covalent bonds with the four terminal bromines. The central carbon has no lone pairs and four bonding pairs, so the molecular geometry is tetrahedral (as is the electron geometry), and bond angles are thus approximately 109.5 degrees.
The typical molecule is CH 4, in which the 1s orbital of a H atom overlap with one of the sp 3 hybrid orbitals to form a C-H bond. Four H atoms form four such bonds, and they are all equivalent. The CH 4 molecule is the most cited molecule to have a tetrahedral shape.