Can I have a few beers while taking amoxicillin for a tooth infection?

Actually you are wrong about it making the amoxicillin less effective. It's a proven fact that alcohol will not make amoxicillin less effective. There's no reaction between the two. If anything it might just make the side effects that amoxicillin gives you like diarrhea a little bit worse. Even people from 8 years ago are saying the same thing. So your advice is trash now keep your inaccurate advice to yourself.

Generally it is recommended not to drink alcohol while being treated with antibiotics for an infection, to give your body the best chance to fight the infection.
However, alcohol will not interfere with the amoxicillin and so in answering your question if you have a few beers your medication will still be 100% effective.

For more detailed information on the effects of alcohol on antibiotics visit:
https://www.drugs.com/article/antibiotics-and-alcohol.html https://www.drugs.com/interactions-check.php?drug_list=1034-14582,187-3052

I found this on ehow.com

Alcohol and Amoxicillin
•There is nothing to suggest that having some alcohol while on Amoxicillin is harmful or will affect the antibiotic. There is no indication the two will have adverse reactions to each other; however, it is better to take the medication well in advance of drinking the alcohol. This way, there is time for the antibiotic to get well absorbed into the system before you drink any alcohol.

From personal experience I have never had adverse effects from taking the two together. There is a myth that if you drink alcohol while on amoxicillin that it will be less effective and this is flat out false. Though there may be other reasons not to drink while on a antibiotic. Like your body has an infection and it is probably a good idea to let your body get the rest it needs. Let's be honest once we start putting some beers in us the last thing we are doing is resting.