Reference for Bekhorot 6:4

חָטְמוֹ שֶׁנִּקַּב, שֶׁנִּפְגַּם, שֶׁנִּסְדַּק, שְׂפָתוֹ שֶׁנִּקְּבָה, שֶׁנִּפְגְּמָה, שֶׁנִּסְדְּקָה, חִטָּיו הַחִיצוֹנוֹת שֶׁנִּפְגְּמוּ אוֹ שֶׁנִּגְמְמוּ, וְהַפְנִימִיּוֹת שֶׁנֶּעֱקָרוּ. רַבִּי חֲנִינָא בֶּן אַנְטִיגְנוֹס אוֹמֵר, אֵין בּוֹדְקִין מִן הַמַּתְאִימוֹת וְלִפְנִים, אַף לֹא אֶת הַמַתְאִימוֹת:

If its nose was pierced or punctured or slit or if its lip was was pierce, punctured or slit, or if its front gums were punctured or [completely] receded, or if [its] back [gums] were uprooted - [these are blemishes]. Rabbi Chaninah ben Antignos says, we do not examine from the molars on back, nor do we examine the molars [themselves].

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