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 CH3 carbon of the ethyl group has tetrahedral geometry since it has bound with three hydrogen atoms and one carbon atom. The other carbon will also attain a tetrahedral geometry when it is bonded to another atom or a molecule. The H-C-H bond angle is 109 o. The carbon atoms in ethyl are sp 3 hybridized.