Hello, and thanks for asking your good questions on Just Answer!
If you can get a hold of your Dental
personnel or receptionist, you may be best off, checking with them - if that venue is available.
If not, I thin it's judgement call for you. Levequin is sometimes used for sinus areas (which is essentially right where #4 is located). And, on the other hand, I'm of the opinion, that because you have no pain, yet an abscess
was seen on the x-ray, that your Dentist
wrote you the Clindamycin as a precautionary measure foremost, and not because of any violent infection with regard to this abscess. So, to NOT take any antibiotic, may be very plausible also, since it is so abrasive to your stomach.
Again, I'd 1st attempt to see what you Doctor thinks. If, unavailable, I think you'll "likely" be safe taking no antibiotic or with the Levaquin, as opposed to the Clindamycin.
The white/opaque look was likely primarily the tooth & it's roots. And, presummably the root tip of #4 - likely had a darker, often roundish more translucent/dark looking abscess. Or, at least this is the most common looking abscess look from an x-ray.
I hope this helps you Ma'am!
Dr. Jerry Rampton