What is the best antibiotic for orofacial infections of an endodontic nature?

Infections of an endodontic nature that are associated with orofacial pain are typically caused by obligate anaerobic bacteria. Given the spectrum of action, penicillins are the preferred antibiotic of choice. Drugs in this class act against the obligate anaerobes but, also affects the substrate interrelationships amongst various bacterial strains within the infection. As some of the strains of bacteria start to die, the others are unable to survive. The penicillins include amoxicillin as well as Augmentin (an amoxicillin and clavulanate combination).
When penicillin is not effective, clindamycin may be used as it acts against anaerobic bacteria. However, clinician’s should use this antibiotic with caution as it has the potential to cause pseudomembranous colitis.
Metronidazole can also be considered alone or in combination with penicillin or amoxicillin. This drug targets gram-negative obligate anaerobes.
Source: Dental Secrets, Elsevier, 2015
It has been my understanding that PenV is the best oral antibiotic for infections of an endodontic nature. What is the antibiotic of choice if one is allergic to Penicillin ?
Clindamycin
Based on recent antibiotic susceptibility tests,
penicillin VK is the drug of choice for periradicular
abscesses .
It is effective against facultative and anaerobic
microorganisms associated with endodontic infections.
Penicillin VK remains the antibiotic of choice because
of its effectiveness, low toxicity and low cost. However,
about 10 percent of the population will give a history
of allergic reactions to penicillin. To achieve a
steady serum level with penicillin VK, it should be
administered every four to six hours . A loading
dose of 1,000 mg of penicillin VK should be orally
administered, followed by 500 mg every four to six
hours for five to seven days. Following debridement of
the root canal system and drainage of facial swellings,
significant improvement of the infection should be seen
within 48-72 hours.
Amoxicillin is an analogue of penicillin that is rapidly
absorbed and has a longer half-life. This is reflected in
higher and more sustained serum levels than penicillin
VK. Because of these traits, amoxicillin is often used
for antibiotic prophylaxis of patients that are medically
compromised . Amoxicillin may be used for
serious odontogenic infections, however, its extended
spectrum may select for additional resistant strains of
bacteria. The usual oral dosage for amoxicillin is 1,000
mg loading dose followed by 500 mg every eight hours
for five to seven days.
From https://www.aae.org/uploadedfiles/…/endodontics…/summer06ecfe.pdf
and https://www.aae.org/…and…/endodontics…for…/ecfewinter12final.pdf