How to get baby to sleep if teething
I try to tire my daughter out, she does get fussy when it's nearing bed time. She'll stay up for at least 4 hours after her last nap until its bedtime and once she's starting to get sleepy I lay her down in her crib. I haven't given her anything for teething except teething toys and a clean finger or cloth to relieve pain naturally. I have a lot of patience with her and let her tell me when she's ready for bed (by body language).
Rubbing the gums with topical pain relief gel is also an option, but you may want to ask your baby's doctor before trying it. If you use too much, it can numb the back of your baby's throat and weaken their gag reflex (which helps prevent them from choking on their saliva). The gels are generally safe to use, but in rare cases can cause an allergic reaction.
Does Selena have any teeth yet? My daughter teethed for MONTHS before the first one popped. :)